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A352761 Number of partial order relations on [n] such that 1 and 2 are in the same connected component. 2
2, 14, 176, 3644, 117860, 5755964, 414823916, 43390462724, 6502296995300, 1380924739533644, 411744185101611356, 170949139294419110804, 98118349844314838731220, 77360523694460582654188124, 83319557470828626639253920716, 121980734453060653381753104078884, 241689591664023311258411470178766020 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..18.

MATHEMATICA

nn = 16; A[x_] := Total[Cases[Import["https://oeis.org/A001035/b001035.txt",

"Table"], {_, _}][[All, 2]]*Table[x^(i - 1)/(i - 1)!, {i, 1, 19}]];

Range[0, nn]! CoefficientList[ Series[D[D[Log[A[x]], x], x] A[x], {x, 0, nn}], x]

CROSSREFS

Cf. A001035, A352399.

Sequence in context: A167014 A300282 A336635 * A208195 A252727 A285270

Adjacent sequences: A352758 A352759 A352760 * A352762 A352763 A352764

KEYWORD

nonn

AUTHOR

Geoffrey Critzer, Jul 05 2022

STATUS

approved

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Last modified December 3 01:25 EST 2022. Contains 358510 sequences. (Running on oeis4.)