A202815 The right-hand half-triangle of A185356 (or A202690).

1, 1, 2, 3, 2, 0, 11, 14, 16, 16, 57, 46, 32, 16, 0, 361, 418, 464, 496, 512, 512, 2763, 2402, 1984, 1520, 1024, 512, 0, 24611, 27374, 29776, 31760, 33280, 34304, 34816, 34816, 250737, 226126, 198752, 168976, 137216, 103936, 69632, 34816, 0

Offset: 1

Author

N. J. A. Sloane, Dec 25 2011

Keywords

• nonn
• tabl

Examples

			Triangle begins:
    1
    1   2
    3   2   0
   11  14  16  16
   57  46  32  16   0
  361 418 464 496 512 512
  ...
		

Links

• M. Josuat-Vergès, J.-C. Novelli and J.-Y. Thibon, The algebraic combinatorics of snakes, arXiv preprint arXiv:1110.5272 [math.CO], 2011.

Crossrefs

Cf. A185356, A202690, A202816.

Programs

PARI

T(n,k) = {if ((k==0), return(0)); if (n==1, if (abs(k)==1, return(1))); if (n%2, if (k<0, sum(j=k+1, n-1, T(n-1,j)), sum(j=k, n-1, T(n-1,j))), if (k<0, sum(j=-n+1, k, T(n-1,j)), sum(j=-n+1, k-1, T(n-1,j))));}
tabl(nn) = {for (n=1, nn, for (k=1, n, if (k, print1(T(n, k), ", "));); print;);} \\ Michel Marcus, Jun 03 2020

Extensions

More terms from Michel Marcus, Jun 03 2020