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A136581 Triangle read by rows: A136572 * A128174. 1
1, 0, 1, 2, 0, 2, 0, 6, 0, 6, 24, 0, 24, 0, 24, 0, 120, 0, 120, 0, 120, 720, 0, 720, 0, 720, 0, 720, 0, 5040, 0, 5040, 0, 5040, 0, 5040 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Row sums = A052558: (1, 1, 4, 12, 72, 360,...).

LINKS

Table of n, a(n) for n=0..35.

FORMULA

A136572 * A128174 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

0, 1;

2, 0, 2;

0, 6, 0, 6;

24, 0, 24, 0, 24;

0, 120, 0, 120, 0, 120;

...

CROSSREFS

Cf. A000142, A052558, A128174, A136572.

Sequence in context: A002117 A042970 A158327 * A175950 A066285 A136665

Adjacent sequences:  A136578 A136579 A136580 * A136582 A136583 A136584

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jan 09 2008

STATUS

approved

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Last modified September 20 20:12 EDT 2019. Contains 327247 sequences. (Running on oeis4.)