A035342
identification: the entry's rule defines the sequence for every index; tail: the sequence is the entry's tail after some prefix rows; match_*: finite agreement only.
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A035342: The convolution matrix of the double factorial of odd numbers (A001147).
(identification, match triangle)
1 · 3, 1 · 15, 9, 1 · 105, 87, 18, 1 … row sums 1, 4, 25, 211, 2236, 28471, 422899, …