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A137596 Triangle, T(n,k), read by rows: A000012 * A048993. 1
1, 1, 1, 1, 2, 1, 1, 3, 4, 1, 1, 4, 11, 7, 1, 1, 5, 26, 32, 11, 1, 1, 6, 57, 122, 76, 16, 1, 1, 7, 120, 423, 426, 156, 22, 1, 1, 8, 247, 1389, 2127, 1206, 288, 29, 1, 1, 9, 502, 4414, 9897, 8157, 2934, 491, 37, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Row sums = A005001 starting (1, 2, 4, 9, 24, 76, 279,...).

LINKS

Table of n, a(n) for n=1..55.

FORMULA

A000012 * A048993 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

1, 1;

1, 2, 1;

1, 3, 4, 1;

1, 4, 11, 7, 1;

1, 5, 26, 32, 11, 1;

1, 6, 57, 122, 76, 16, 1;

1, 7, 120, 423, 426, 156, 22, 1;

...

CROSSREFS

Cf. A005001, A048993.

Sequence in context: A137153 A063841 A256161 * A111669 A124834 A271465

Adjacent sequences:  A137593 A137594 A137595 * A137597 A137598 A137599

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jan 29 2008

STATUS

approved

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Last modified February 21 23:29 EST 2019. Contains 320381 sequences. (Running on oeis4.)