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A369373
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a(n) is the constant term in expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^4.
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1
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1, 19, 701, 33873, 1884211, 113091013, 7138569079, 466998324373, 31378587089717, 2152644125539205, 150149036955370989, 10616242785424087153, 759159709650751045807, 54809160248598728775119, 3989668904561505824038609, 292488794939698331845055779, 21576667915867159070829849217
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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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Table[Coefficient[Product[(x^k + 1 + 1/x^k)^4, {k, 1, n}], x, 0], {n, 0, 16}]
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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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