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 A117434 Expansion of c(x*y(1+x)), c(x) the g.f. of A000108. 4
 1, 0, 1, 0, 1, 2, 0, 0, 4, 5, 0, 0, 2, 15, 14, 0, 0, 0, 15, 56, 42, 0, 0, 0, 5, 84, 210, 132, 0, 0, 0, 0, 56, 420, 792, 429, 0, 0, 0, 0, 14, 420, 1980, 3003, 1430, 0, 0, 0, 0, 0, 210, 2640, 9009, 11440, 4862, 0, 0, 0, 0, 0, 42, 1980, 15015, 40040, 43758, 16796, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS Row sums are A052709(n+1). Diagonal sums are A115178. Alternating sign version is A115179. LINKS FORMULA Number triangle T(n,k)=C(k)C(k,n-k). EXAMPLE Triangle begins .1, .0, 1, .0, 1, 2, .0, 0, 4, 5, .0, 0, 2, 15, 14, .0, 0, 0, 15, 56, 42, .0, 0, 0, 5, 84, 210, 132, .0, 0, 0, 0, 56, 420, 792, 429 CROSSREFS Sequence in context: A107498 A094295 A085969 * A115179 A131742 A257813 Adjacent sequences:  A117431 A117432 A117433 * A117435 A117436 A117437 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Mar 14 2006 STATUS approved

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Last modified February 18 15:30 EST 2020. Contains 332019 sequences. (Running on oeis4.)