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A177993 Triangle read by rows, A177990 * A007318 3
1, 1, 1, 2, 3, 1, 2, 4, 3, 1, 3, 8, 9, 5, 1, 3, 9, 13, 11, 5, 1, 4, 15, 28, 31, 20, 7, 1, 4, 16, 34, 46, 40, 22, 7, 1, 5, 24, 62, 102, 110, 78, 35, 9, 1, 5, 25, 70, 130, 166, 148, 91, 37, 9, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Row sums = A061547: (1, 2, 6, 10, 26, 42, 106,...)

LINKS

Table of n, a(n) for n=0..54.

FORMULA

As infinite lower triangular matrices, A177990 * Pascal's triangle, (A007318).

EXAMPLE

First few rows of the triangle =

1;

1, 1;

2, 3, 1;

2, 4, 3, 1;

3, 8, 9, 5, 1;

3, 9, 13, 11, 5, 1;

4, 15, 28, 31, 20, 7, 1;

4, 16, 34, 46, 40, 22, 7, 1;

5, 24, 62, 102, 110, 78, 35, 9, 1;

5, 25, 70, 130, 166, 148, 91, 37, 9, 1;

6, 35, 115, 250, 376, 400, 301, 157, 54, 11, 1;

6, 36, 125, 295, 496, 610, 553, 367, 174, 56, 11, 1;

7, 48, 191, 515, 991, 1402, 1477, 1159, 669, 276, 77, 13, 1;

7, 49, 203, 581, 1211, 1897, 2269, 2083, 1461, 771, 297, 709, 13, 1;

...

CROSSREFS

Cf. A177992 = A007318 * A177990.

Cf. A061547.

Sequence in context: A233359 A279345 A097966 * A256990 A071503 A029271

Adjacent sequences:  A177990 A177991 A177992 * A177994 A177995 A177996

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, May 16 2010

STATUS

approved

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Last modified March 21 12:12 EDT 2019. Contains 321369 sequences. (Running on oeis4.)