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A171243
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Riordan array (f(x), x*g(x)), f(x) is the g.f. of A126952, g(x) is the g.f. of A117641.
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2
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1, 1, 1, 5, 1, 1, 21, 6, 1, 1, 93, 25, 7, 1, 1, 421, 112, 29, 8, 1, 1, 1937, 510, 132, 33, 9, 1, 1, 9017, 2357, 606, 153, 37, 10, 1, 1, 42349, 11009, 2819, 709, 175, 41, 11, 1, 1, 200277, 51840, 13233, 3324, 819, 198, 45, 12, 1, 1
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OFFSET
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0,4
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COMMENTS
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Expansion of row sums of T_(x,3), T_(x,y) defined in A039599.
Matrix product P^3 * Q * P^(-3), where P denotes Pascal's triangle A007318 and Q denotes A061554 (formed from P by sorting the rows into descending order). Cf. A158793 and A158815. - Peter Bala, Jul 13 2021
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LINKS
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FORMULA
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EXAMPLE
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Triangle begins:
1;
1, 1;
5, 1, 1;
21, 6, 1, 1;
93, 25, 7, 1, 1;
421, 112, 29, 8, 1, 1;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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