A115237 Matrix square of triangle A003983.

1, 2, 1, 4, 4, 1, 6, 8, 4, 1, 9, 14, 10, 4, 1, 12, 20, 18, 10, 4, 1, 16, 28, 29, 20, 10, 4, 1, 20, 36, 41, 33, 20, 10, 4, 1, 25, 46, 56, 50, 35, 20, 10, 4, 1, 30, 56, 71, 69, 54, 35, 20, 10, 4, 1, 36, 68, 89, 92, 78, 56, 35, 20, 10, 4, 1, 42, 80, 107, 116, 105, 82, 56, 35, 20, 10, 4, 1

Offset

0,2

Links

Table of n, a(n) for n=0..77.

Example

1; 2,1; 4,4,1; 6,8,4,1; 9,14,10,4,1; ...

Crossrefs

Column 0: A002620(n+2). Row sums: A115238. Convergent of columns: A000292.

Sequence in context: A070785 A214985 A105537 * A105542 A208907 A200057

Adjacent sequences: A115234 A115235 A115236 * A115238 A115239 A115240

Keyword

nonn,tabl

Author

Christian G. Bower, Jan 17 2006

Status

approved