cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A113099 Triangle T, read by rows, equal to the matrix cube of triangle A113095, which satisfies the recurrence: A113095(n,k) = [A113095^4](n-1,k-1) + [A113095^4](n-1,k).

Original entry on oeis.org

1, 3, 1, 27, 15, 1, 693, 513, 63, 1, 52812, 47619, 8289, 255, 1, 12628008, 13176189, 2920527, 131841, 1023, 1, 9924266772, 11586274263, 3078907929, 181929087, 2101761, 4095, 1, 26507035453923, 33825995695125, 10365262415703
Offset: 0

Views

Author

Paul D. Hanna, Oct 14 2005

Keywords

Examples

			Triangle begins:
1;
3,1;
27,15,1;
693,513,63,1;
52812,47619,8289,255,1;
12628008,13176189,2920527,131841,1023,1;
9924266772,11586274263,3078907929,181929087,2101761,4095,1; ...
		

Crossrefs

Programs

  • PARI
    {T(n,k)=local(M=matrix(n+1,n+1));for(r=1,n+1, for(c=1,r, M[r,c]=if(r==c,1,if(c>1,(M^4)[r-1,c-1])+(M^4)[r-1,c]))); return((M^3)[n+1,k+1])}