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A014780
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Triangle of numbers associated with Genocchi numbers.
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0
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1, 1, 1, 1, 3, 3, 5, 3, 3, 17, 17, 31, 25, 31, 17, 17, 155, 155, 293, 259, 349, 259, 293, 155, 155, 2073, 2073, 3991, 3681, 5151, 4289, 5151, 3681, 3991, 2073, 2073, 38227, 38227, 74381, 70235, 100325, 88507, 109765, 88507, 100325, 70235, 74381, 38227
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OFFSET
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1,5
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COMMENTS
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When written in the triangle form as in the example below, the k-th entry (k>=1) in row n (n>=1) is the number of Dumont permutations of the first kind of length 2*n that start with k+1. - Alexander Burstein, May 14 2022
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LINKS
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FORMULA
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EXAMPLE
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Triangle begins:
1;
1, 1, 1;
3, 3, 5, 3, 3;
17, 17, 31, 25, 31, 17, 17;
...
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CROSSREFS
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KEYWORD
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tabf,nonn,easy
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AUTHOR
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EXTENSIONS
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More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 22 2003
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STATUS
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approved
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