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A059227 Last entry in n-th row of triangle defined in A059226. 6
1, 1, 4, 18, 94, 544, 3370, 21878, 146924, 1012222, 7114218, 50808592, 367669254, 2689974234, 19864822564, 147875395930, 1108469655350, 8359790718480, 63387403235682, 482935966313310, 3695204342149004, 28383451250732662 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..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], {n, 0, 25}] (* G. C. Greubel, Jan 03 2017 *)

CROSSREFS

Sequence in context: A200717 A121584 A209256 * A259533 A305239 A081103

Adjacent sequences:  A059224 A059225 A059226 * A059228 A059229 A059230

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 19 2001

STATUS

approved

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Last modified March 22 17:25 EDT 2019. Contains 321422 sequences. (Running on oeis4.)