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Search: id:A051880
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| 1, 15, 75, 245, 630, 1386, 2730, 4950, 8415, 13585, 21021, 31395, 45500, 64260, 88740, 120156, 159885, 209475, 270655, 345345, 435666, 543950, 672750, 824850, 1003275, 1211301, 1452465, 1730575
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.
Herbert John Ryser, Combinatorial Mathematics, "The Carus Mathematical Monographs", No. 14, John Wiley and Sons, 1963, pp. 1-16.
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FORMULA
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a(n)=C(n+4, 4)*(2n+1).
G.f.: (1+9*x)/(1-x)^6.
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CROSSREFS
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Cf. A051799.
Cf. A093645 ((10, 1) Pascal, column m=5).
Sequence in context: A022675 A116632 A135916 this_sequence A007328 A049391 A000477
Adjacent sequences: A051877 A051878 A051879 this_sequence A051881 A051882 A051883
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KEYWORD
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easy,nonn
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AUTHOR
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Barry E. Williams, Dec 14 1999
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