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A371309
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Expansion of e.g.f. Product_{k>=1} (1 + x^k/k!)^(k^2).
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1
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1, 1, 4, 21, 88, 645, 4386, 33061, 296808, 2674377, 26757190, 285294801, 3199971336, 38104015417, 476816609192, 6261875218215, 85736036949856, 1227373767823617, 18255004438680558, 281702101344334993, 4509097743074878200, 74606738071821274641, 1275212550939684334384
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OFFSET
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0,3
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COMMENTS
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"EGJ" (unordered, element, labeled) transform of squares.
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LINKS
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MATHEMATICA
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nmax = 22; CoefficientList[Series[Product[(1 + x^k/k!)^(k^2), {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]!
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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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