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A308476 a(1) = 1; a(n) = Sum_{k=1..n-1, gcd(n,k) = 1} Stirling2(n,k)*a(k). 0
1, 1, 4, 25, 366, 5491, 176569, 5332097, 276268942, 13470365431, 1135683784753, 75066413338423, 9256260956838520, 918768523598548169, 140268128758724744770, 18398287904991375995745, 3879391299475140314514162, 594721341754741064012714341 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..18.

MATHEMATICA

a[n_] := Sum[If[GCD[n, k] == 1, StirlingS2[n, k] a[k], 0], {k, 1, n - 1}]; a[1] = 1; Table[a[n], {n, 1, 18}]

CROSSREFS

Cf. A005121, A045545, A308463.

Sequence in context: A222982 A259591 A093959 * A222902 A086216 A167041

Adjacent sequences:  A308473 A308474 A308475 * A308477 A308478 A308479

KEYWORD

nonn

AUTHOR

Ilya Gutkovskiy, May 29 2019

STATUS

approved

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Last modified October 17 16:31 EDT 2019. Contains 328117 sequences. (Running on oeis4.)