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 A308866 a(n) = Sum_{k>=0} k^(2^n)/2^(k+1). 0
 1, 3, 75, 545835, 5315654681981355, 23545154085734896649184490637144855476395, 1408419189834457368564204829523128565178390518208834734403870775971211916384631776000167564122146475 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n) = Sum_{k=0..2^n} k!*Stirling2(2^n,k). a(n) = A000670(A000079(n)). MATHEMATICA Table[Sum[k^(2^n)/2^(k + 1), {k, 0, Infinity}], {n, 0, 6}] Table[Sum[k! StirlingS2[2^n, k], {k, 0, 2^n}], {n, 0, 6}] CROSSREFS Cf. A000079, A000670, A008277, A135085. Sequence in context: A336062 A320306 A238000 * A089301 A037110 A168385 Adjacent sequences:  A308863 A308864 A308865 * A308867 A308868 A308869 KEYWORD nonn AUTHOR Ilya Gutkovskiy, Jun 29 2019 STATUS approved

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Last modified May 21 10:41 EDT 2022. Contains 353908 sequences. (Running on oeis4.)