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A115237
Matrix square of triangle A003983.
2
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
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
KEYWORD
nonn,tabl
AUTHOR
Christian G. Bower, Jan 17 2006
STATUS
approved