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A250106
Column 2 of triangle in A250104 (or A124323).
2
1, 0, 6, 10, 60, 231, 1148, 5832, 32175, 188375, 1169652, 7663734, 52808847, 381494400, 2881338840, 22696790440, 186058768140, 1584156272157, 13984151627030, 127779961705620, 1206805491491985, 11764472685724561, 118230099056654664
OFFSET
2,3
LINKS
T. Mansour, A. O. Munagi, Set partitions with circular successions, European Journal of Combinatorics, 42 (2014), 207-216.
MAPLE
A250106 := proc(n)
A124323(n, 2) ;
end proc:
seq(A250106(n), n=2..50) ; # R. J. Mathar, Jan 22 2015
MATHEMATICA
t[n_, k_] := Binomial[n, k] ((-1)^(n-k) + Sum[(-1)^(j-1) BellB[n-k-j], {j, 1, n-k}]);
Table[t[n, 2], {n, 2, 24}] (* Jean-François Alcover, Apr 03 2020 *)
CROSSREFS
Sequence in context: A136848 A136849 A136847 * A230827 A372070 A111484
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 16 2014
STATUS
approved