A059229 - OEIS

A059229

A diagonal of triangle defined in A059226.

0, 2, 12, 70, 426, 2708, 17846, 121014, 839388, 5929162, 42509318, 308561388, 2263197114, 16748071210, 124893822012, 937612685502, 7080464093282, 53748285892004, 409909445733950, 3139241855256334, 24132284421690988

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OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..250

Index entries for sequences related to boustrophedon transform

MATHEMATICA

T[i_, j_]:= T[i, j] = Module[{r, s, t1}, If[i == 0 && j == 0, Return[1]]; If[j == 0, Return[0]]; t1 = T[i, j - 1]; For[r = 0, r <= i - j, r++,

For[s = 0, s <= j, s++, If[r + s != i, t1 = t1 + T[r + s, s]]]]; Return[t1]]; Table[T[n, n - 1], {n, 1, 25}] (* G. C. Greubel, Jan 03 2017 *)

CROSSREFS

Sequence in context: A026306 A116398 A001542 * A001251 A143357 A357831

Adjacent sequences: A059226 A059227 A059228 * A059230 A059231 A059232

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 19 2001

STATUS

approved