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A303651
Main diagonal of irregular triangle A303650.
3
1, 3, 15, 100, 840, 8589, 104104, 1463760, 23457780, 422352880, 8443603509, 185620024044, 4450814005365, 115607871091860, 3233811469903935, 96919878129098048, 3098520826729103844, 105255099799959987720, 3785952834976524485140, 143750180460098987633040, 5745630052052437089326175, 241143250707191288860686084, 10603124545177769605263358275, 487432649463606266257377179400
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A372157 A147664 A219779 * A350954 A196962 A074521
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 30 2018
STATUS
approved