0,2
Table of n, a(n) for n=0..16.
(PARI) {a(n)=local(A, B); A=matrix(1, 1); A[1, 1]=1; for(m=2, n+3, 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); A[n+3, 3]}
Cf. A113341 (column 1), A113343 (column 3), A113344 (column 4), A113340.
Sequence in context: A051577 A102147 A124564 * A201367 A125864 A210996
Adjacent sequences: A113339 A113340 A113341 * A113343 A113344 A113345
nonn
Paul D. Hanna, Nov 08 2005
approved
