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A133200 A001263 * A136521 as infinite lower triangular matrices, where A001263 = the Narayana triangle and A136521 = an infinite lower triangular matrix with (1, 2, 2, 2,...) in the main diagonal and the rest zeros. 0
1, 1, 2, 1, 6, 2, 1, 12, 12, 2, 1, 20, 40, 20, 2, 1, 30, 100, 100, 30, 2, 1, 42, 210, 350, 210, 42, 2, 1, 56, 392, 980, 980, 392, 56, 2, 1, 72, 672, 2352, 3528, 2352, 672, 72, 2, 1, 90, 1080, 5040, 10584, 10584, 5040, 1080, 90, 2 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row sums = A131428 starting (1, 3, 9, 27, 83, 263,...).

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

First few rows of the triangle are:

1;

1, 2;

1, 6, 2;

1, 12, 12, 2;

1, 20, 40, 20, 2;

1, 30, 100, 100, 30, 2;

1, 42, 210, 350, 210, 42, 2;

...

CROSSREFS

Cf. A001263, A136521.

Sequence in context: A208905 A208749 A208751 * A103881 A101024 A124730

Adjacent sequences:  A133197 A133198 A133199 * A133201 A133202 A133203

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jan 02 2008

STATUS

approved

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Last modified February 17 20:22 EST 2019. Contains 320223 sequences. (Running on oeis4.)