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A128077
3
1, 1, 4, 1, 2, 9, 1, 2, 3, 16, 1, 2, 3, 4, 25, 1, 2, 3, 4, 5, 36, 1, 2, 3, 4, 5, 6, 49, 1, 2, 3, 4, 5, 6, 7, 64
OFFSET
1,3
COMMENTS
Row sums = the pentagonal numbers, A000326: 1, 5, 12, 22, 35, 51, ...
FORMULA
A128064 * A002260 as infinite lower triangular matrices. Triangle read by rows, a(1) = 1; n-th row = first (n-1) terms of (1, 2, 3, ...) followed by n^2.
EXAMPLE
First few rows of the triangle:
1;
1, 4;
1, 2, 9;
1, 2, 3, 16;
1, 2, 3, 4, 25;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Feb 14 2007
STATUS
approved