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A131768 2*(A007318 * A097807) - A000012. 2
1, 3, 1, 5, 5, 1, 7, 11, 7, 1, 9, 19, 19, 9, 1, 11, 29, 39, 29, 11, 1, 13, 41, 69, 69, 41, 13, 1, 15, 55, 111, 139, 111, 55, 15, 1, 17, 71, 167, 251, 251, 167, 71, 17, 1, 19, 89, 239, 419, 503, 419, 239, 89, 19, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums = A000295, the Eulerian numbers, starting (1, 4, 11, 26, 57, 120,...).

LINKS

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

FORMULA

2*(A007318 * A097807) - A000012 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

3, 1;

5, 5, 1;

7, 11, 7, 1;

9, 19, 19, 9, 1;

11, 29, 39, 29, 11, 1;

13, 41, 69, 69, 41, 13, 1;

15, 55, 111, 139, 111, 55, 15, 1;

...

CROSSREFS

Cf. A007318, A097807, A000012, A000295.

Sequence in context: A131302 A131305 A131303 * A232632 A084533 A082985

Adjacent sequences:  A131765 A131766 A131767 * A131769 A131770 A131771

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jul 13 2007

STATUS

approved

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Last modified March 29 02:19 EDT 2020. Contains 333104 sequences. (Running on oeis4.)