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Search: id:A082735
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| 1, 8, 105, 5760, 328185, 42577920, 5568833025, 1300252262400, 304513870485825, 111644006842368000, 40992233865440682825, 21695920874860629196800, 11492457771692770753505625, 8291067715225260172247040000
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OFFSET
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1,2
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FORMULA
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a(1) = 1, a(2n) = product of next 2n even numbers. a(2n+1) = product of next 2n+1 odd numbers.
a(n)=A006882[A074148(n)]/A006882[A074148(n-2)]. a(2n-1)=A062031(n). a(2n)=A062030(n). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 17 2007
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MAPLE
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A074148 := proc(n) (2*n^2+4*n+(-1)^n-1)/4 ; end: A082735 := proc(n) doublefactorial(A074148(n))/doublefactorial(A074148(n-2)) ; end: seq(A082735(n), n=1..20) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 17 2007
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CROSSREFS
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Cf. A074147, A074148, A074149, A082736.
Sequence in context: A119934 A001922 A113551 this_sequence A024358 A055406 A129278
Adjacent sequences: A082732 A082733 A082734 this_sequence A082736 A082737 A082738
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 14 2003
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EXTENSIONS
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Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 17 2007
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