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A132621 Column 0 of triangle A132620. 2
1, 1, 2, 9, 76, 1015, 18996, 461160, 13810056, 492785919, 20433145960, 966019244498, 51307359002780, 3025299547565555, 196128997903654830, 13867432141912978212, 1062114397213146583512, 87606299906342573320663 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Triangle T=A132620 is defined by: antidiagonal k of T = antidiagonal k-1 of T^k (after appending '1' for even k) for k>0, with T(n,n)=1 for n>=0.

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Cf. A132620 (triangle), A132622 (column 1).

Sequence in context: A245406 A276742 A123680 * A108992 A058164 A006059

Adjacent sequences:  A132618 A132619 A132620 * A132622 A132623 A132624

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Aug 24 2007

STATUS

approved

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Last modified October 17 19:24 EDT 2019. Contains 328127 sequences. (Running on oeis4.)