|
|
A113995
|
|
Column 3 of triangle A113993, also equals column 0 of A113983^4.
|
|
6
|
|
|
1, 4, 16, 64, 276, 1304, 6808, 39320, 250752, 1759604, 13530928, 113522192, 1034613180, 10199679712, 108334569184, 1235056156832, 15059906315120, 195775382409972, 2705084927865600, 39616257445460560, 613348477806011476
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
EXAMPLE
|
1;
4,1;
16,8,1;
64,48,12,1;
276,272,100,16,1;
1304,1576,752,172,20,1;
6808,9664,5592,1624,264,24,1;
39320,63696,42848,14828,3008,376,28,1;
250752,454192,345200,136888,32628,5024,508,32,1; ...
|
|
PROG
|
(PARI) a(n)=local(A, B); A=Mat(1); for(m=2, n+2, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3 || j==1 || j==i, B[i, j]=1, B[i, j]=A[i-1, j-1]+(A^2)[i-2, j-1] ); )); A=B); (A^4)[n+1, 1]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|