A113365 Matrix cube of triangle A113350.

1, 6, 1, 39, 12, 1, 327, 138, 18, 1, 3556, 1830, 297, 24, 1, 48659, 28805, 5349, 516, 30, 1, 812462, 535004, 109095, 11724, 795, 36, 1, 16136404, 11568197, 2529909, 292894, 21795, 1134, 42, 1, 373415239, 287143993, 66345668, 8117624, 643790, 36402, 1533

Offset

0,2

Links

Table of n, a(n) for n=0..42.

Formula

Column k of A113350^3 = column 1 of A113340^(2*k+2) for k>=0.

Example

Triangle begins:
1;
6,1;
39,12,1;
327,138,18,1;
3556,1830,297,24,1;
48659,28805,5349,516,30,1;
812462,535004,109095,11724,795,36,1;
16136404,11568197,2529909,292894,21795,1134,42,1;
373415239,287143993,66345668,8117624,643790,36402,1533,48,1; ...

Prog

(PARI) T(n, k)=local(A, B); A=matrix(1, 1); A[1, 1]=1; for(m=2, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3 || j==i || j>m-1, B[i, j]=1, if(j==1, B[i, 1]=1, B[i, j]=(A^(2*j-1))[i-j+1, 1])); )); A=B); (matrix(#A, #A, r, c, if(r>=c, (A^(2*c))[r-c+1, 1]))^3)[n+1, k+1]

Crossrefs

Cf. A113340, A113350, A113346 (column 0), A113366 (column 1), A113367 (column 2); A113355 (=A113350^2), A113360 (=A113340^3).

Sequence in context: A075501 A089504 A145927 * A293172 A145356 A145357

Adjacent sequences: A113362 A113363 A113364 * A113366 A113367 A113368

Keyword

nonn,tabl

Author

Paul D. Hanna, Nov 09 2005

Status

approved