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

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

1,2

Links

Table of n, a(n) for n=1..42.

Example

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

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

Crossrefs

Sequence in context: A326374 A143565 A143018 * A128249 A071211 A222029

Adjacent sequences: A102009 A102010 A102011 * A102013 A102014 A102015

Keyword

nonn,tabl

Author

David Applegate, Jun 19 2007

Extensions

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

Status

approved