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A322514
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a(n) = [x^(n^2)] (Sum_{k=0..2*n} (k+1)*x^k)^n.
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0
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1, 2, 35, 1624, 169653, 30961656, 8792309747, 3592089777760, 1998565555891049, 1454040182726241040, 1340732073013968993771, 1528443066775450331625912, 2111332024387378632991315275, 3475577885419591506890414078832
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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f[n_] := Coefficient[Expand[Sum[(k+1)*x^k , {k, 0, 2n}]^n, x], x, n^2]; Array[f, 15, 0] (* Amiram Eldar, Dec 13 2018 *)
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PROG
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(PARI) {a(n) = polcoeff((sum(k=0, 2*n, (k+1)*x^k))^n, n^2, x)}
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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