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Search: id:A084942
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| A084942 |
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Enneagorials: n-th polygorial for k=9. |
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+0
14
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| 1, 1, 9, 216, 9936, 745200, 82717200, 12738448800, 2598643555200, 678245967907200, 220429939569840000, 87290256069656640000, 41375581377017247360000, 23128949989752641274240000
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OFFSET
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0,3
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FORMULA
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A084942(n) = Polygorial(n, 9) = A000142(n)/A000079(n)*A084947(n) = n!/2^n*product(7*i+2, i=0..n-1) = n!/2^n*7^n*pochhammer(2/7, n) = n!/2^n*7^n*GAMMA(n+2/7)/GAMMA(2/7)
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MAPLE
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a := n->n!/2^n*product(7*i+2, i=0..n-1); [seq(a(j), j=0..30)];
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CROSSREFS
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Cf. A006472, A001044, A000680, A084939, A084940, A084941, A084943, A084944, A085356.
Sequence in context: A007108 A007107 A064633 this_sequence A061718 A085741 A079913
Adjacent sequences: A084939 A084940 A084941 this_sequence A084943 A084944 A084945
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KEYWORD
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easy,nonn
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AUTHOR
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Daniel Dockery (peritus(AT)gmail.com) Jun 13 2003
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