Root regions
Nodes grouped by the interval that contains every root of every row (proved, for all n). A node can have several proved regions; the sharpest is the smallest interval.
Nodes with all roots in (-5, -1) (6)
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A111125 → x ↦ x+1
1 · 4, 1 · 11, 7, 1 · 29, 31, 10, 1 … row sums 1, 5, 19, 71, 265, 989, 3691, 13775, …
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A207607 → basis A007318
1 · 3, 2 · 8, 9, 2 · 21, 33, 15, 2 … row sums 1, 5, 19, 71, 265, 989, 3691, 13775, …
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A085478 → x ↦ x+1
1 · 1 · 2, 1 · 5, 5, 1 … row sums 1, 1, 3, 11, 41, 153, 571, 2131, …
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A207606 → basis A007318
13, 11, 2 · 34, 44, 17, 2 · 89, 155, 93, 23, 2 … row sums 26, 97, 362, 1351, 5042, 18817, 70226, …
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A078812 → basis A007318
1 · 3, 1 · 8, 6, 1 · 21, 25, 9, 1 … row sums 1, 4, 15, 56, 209, 780, 2911, 10864, …
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A125662: A convolution triangle of numbers based on A001906 (even-indexed Fibonacci numbers).
1 · 3, 1 · 8, 6, 1 · 21, 25, 9, 1 … row sums 1, 4, 15, 56, 209, 780, 2911, 10864, …