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Search: id:A051621
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| A051621 |
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(4*n+9)(!^4)/9(!^4), related to A007696(n+1) ((4*n+1)(!^4) quartic, or 4-factorials). |
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2
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| 1, 13, 221, 4641, 116025, 3364725, 111035925, 4108329225, 168441498225, 7579867420125, 371413503586125, 19684915690064625, 1122040194333683625, 68444451854354701125, 4448889370533055573125, 306973366566780834545625
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row m=9 of the array A(5; m,n) := ((4*n+m)(!^4))/m(!^4), m >= 0, n >= 0.
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FORMULA
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a(n) = ((4*n+9)(!^4))/9(!^4)= A007696(n+3)/(5*9); e.g.f.: 1/(1-4*x)^(13/4).
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CROSSREFS
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Cf. A047053, A007696(n+1), A000407, A034176(n+1), A034177(n+1), A051617-A051622 (rows m=0..10).
Sequence in context: A059525 A086147 A015253 this_sequence A051180 A140841 A062127
Adjacent sequences: A051618 A051619 A051620 this_sequence A051622 A051623 A051624
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KEYWORD
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easy,nonn
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)
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