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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
OFFSET
1,3
COMMENTS
Row sums = A131428 starting (1, 3, 9, 27, 83, 263, ...).
EXAMPLE
First few rows of the triangle:
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
Sequence in context: A208905 A208749 A208751 * A103881 A101024 A124730
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jan 02 2008
STATUS
approved