A085841
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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A085841: Triangle: row #n has n+1 terms. T(n,m) = 4^m (2n+1)! / ( (2n-2m)! (2m+1)! ).
(identification, match triangle)
1 · 3, 4 · 5, 40, 16 · 7, 140, 336, 64 … row sums 1, 7, 61, 547, 4921, 44287, 398581, …