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A059510 Main diagonal of the array A059220. 1
1, 1, 8, 152, 4493, 202066, 12841750, 1097043147, 121284672716, 16850062144162, 2873723485196575, 590279507847844136, 143737044733324878879, 40943428029694983816963, 13488163010054730357533318, 5088553275271661089776406989 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..240

MATHEMATICA

t[0, 0] = 1; t[0, _?EvenQ] = 0; t[_?OddQ, 0] = 0; t[n_, k_] /; OddQ[n + k] (*up*):= t[n, k] = t[n + 1, k - 1] + Sum[t[n, j], {j, 0, k - 1}];

t[n_, k_] /; EvenQ[n + k] (*down*):= t[n, k] = t[n - 1, k + 1] + Sum[t[j, k], {j, 0, n - 1}]; Table[t[n, n], {n, 0, 50}] (* G. C. Greubel, Sep 10 2017 *)

CROSSREFS

Sequence in context: A249931 A123770 A003400 * A264708 A094059 A171202

Adjacent sequences:  A059507 A059508 A059509 * A059511 A059512 A059513

KEYWORD

easy,nonn

AUTHOR

Floor van Lamoen, Jan 21 2001

EXTENSIONS

Terms a(11) onward added by G. C. Greubel, Sep 10 2017

STATUS

approved

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Last modified August 14 19:47 EDT 2020. Contains 336483 sequences. (Running on oeis4.)