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A135722 A000012 * A122890. 1
1, 1, 1, 1, 1, 2, 1, 1, 3, 5, 1, 1, 3, 15, 14, 1, 1, 3, 23, 84, 42, 1, 1, 3, 27, 244, 466, 132, 1, 1, 3, 28, 494, 2444, 2514, 429, 1, 1, 3, 28, 796, 8720, 22022, 13233, 1430, 1, 1, 3, 28, 1094, 24394, 128514, 181841, 68376, 4862 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,6

COMMENTS

Row sums = A003422: (1, 2, 4, 10, 34, 154, 874,...). Main diagonal = A000108, the Catalan numbers: (1, 1, 2, 5, 14, 42, 132,...)

LINKS

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

FORMULA

A000012 * A122890 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

1, 1;

1, 1, 2;

1, 1, 3, 5;

1, 1, 3, 15, 14;

1, 1, 3, 23, 84, 42;

1, 1, 3, 27, 244, 466, 132;

1, 1, 3, 28, 494, 2444, 2514, 429;

...

CROSSREFS

Cf. A003422, A122890, A000108.

Sequence in context: A057044 A153899 A068098 * A258306 A049513 A121207

Adjacent sequences:  A135719 A135720 A135721 * A135723 A135724 A135725

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Nov 25 2007

STATUS

approved

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Last modified August 3 20:43 EDT 2021. Contains 346441 sequences. (Running on oeis4.)