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A135723 A122890 + A000012 - I, I = Identity matrix. 2
1, 1, 1, 1, 1, 2, 1, 1, 2, 5, 1, 1, 1, 11, 14, 1, 1, 1, 9, 71, 42, 1, 1, 1, 5, 161, 425, 132, 1, 1, 1, 2, 251, 1979, 2383, 429, 1, 1, 1, 1, 303, 6277, 19509, 12805, 1430, 1, 1, 1, 1, 299, 15675, 106493, 168609, 66947, 4862 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,6

COMMENTS

Row sums = A005095: (1, 2, 4, 9, 28, 125, 726,...). Main diagonal = A000108, the Catalan numbers: (1, 1, 2, 5, 14, 42, 132,...).

LINKS

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

FORMULA

A122890 + A000012 - Identity matrix; as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

1, 1;

1, 1, 2;

1, 1, 2, 5;

1, 1, 1, 11, 14;

1, 1, 1, 9, 71, 42;

1, 1, 1, 5, 161, 425, 132;

1, 1, 1, 2, 251, 1979, 2383, 429;

...

CROSSREFS

Cf. A122890, A005095, A000108.

Sequence in context: A213953 A000361 A246596 * A125311 A127568 A263791

Adjacent sequences:  A135720 A135721 A135722 * A135724 A135725 A135726

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Nov 25 2007

STATUS

approved

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Last modified May 31 20:23 EDT 2020. Contains 334748 sequences. (Running on oeis4.)