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.

A102012 Triangle formed by right half of A101842, read by rows.

Original entry on oeis.org

1, 3, 1, 16, 7, 1, 115, 61, 15, 1, 1056, 626, 206, 31, 1, 11774, 7554, 2989, 659, 63, 1, 154624, 105099, 47349, 13308, 2052, 127, 1, 2337507, 1660957, 824331, 274677, 56935, 6297, 255, 1, 39984640, 29428654, 15747154, 5960818, 1518478, 237862
Offset: 1

Views

Author

David Applegate, Jun 19 2007

Keywords

Examples

			Triangle begins:
1
3, 1
16, 7, 1
115, 61, 15, 1
1056, 626, 206, 31, 1
11774, 7554, 2989, 659, 63, 1
		

Programs

  • Maple
    A101842 := proc(n,k) option remember ; if k < -n or k >= n then 0 ; elif n = 1 then 1; else (n-k)*A101842(n-1,k-1)+A101842(n-1,k)+(n+k+1)*A101842(n-1,k+1) ; fi ; end: A102012 := proc(n,k) A101842(n,k-1) ; end: for n from 1 to 10 do for k from 1 to n do printf("%d, ",A102012(n,k)) ; od: od: # R. J. Mathar, Aug 07 2007

Extensions

More terms from R. J. Mathar, Aug 07 2007