|
|
A121396
|
|
Column 1 of triangle T=A121395, where column k of T equals column k of T^(2^k) shift down 1 row.
|
|
2
|
|
|
1, 1, 2, 5, 16, 75, 594, 8420, 212790, 9542280, 763184598, 109735708579, 28582820337914, 13580038203578493, 11845224434439055236, 19084161956327789507755, 57113015617717986294647190
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,3
|
|
COMMENTS
|
Also equals column 1 of the matrix square of triangle A121395.
|
|
LINKS
|
|
|
PROG
|
(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+2, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, B[i, j]=(A^(2^(j-1)))[i-1, j]); )); A=B); return(A[n+2, 2])}
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|