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Search: id:A005721
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| A005721 |
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Central quadrinomial coefficients.
(Formerly M3681)
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+0
2
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| 1, 4, 44, 580, 8092, 116304, 1703636, 25288120, 379061020, 5724954544, 86981744944, 1327977811076, 20356299454276, 313095240079600, 4829571309488760, 74683398325804080, 1157402982351003420, 17971185794898859248
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 78.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..100
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FORMULA
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a(n)= A005190(2*n) = A008287(2*n, 3*n).
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CROSSREFS
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Sequence in context: A087813 A082779 A053315 this_sequence A103870 A056063 A053332
Adjacent sequences: A005718 A005719 A005720 this_sequence A005722 A005723 A005724
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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