A370960 a(n) = number of acyclic orientations of the complete tripartite graph K_{2,2,n}.

14, 78, 426, 2286, 12090, 63198, 327306, 1682766, 8601690, 43768638, 221910186, 1121897646, 5659111290, 28494757278, 143272715466, 719565670926, 3610655860890, 18104646725118, 90728875495146, 454467461514606, 2275631193410490, 11391336159448158, 57009415513961226, 285258058278100686, 1427134339747920090

Offset

0,1

Links

Alois P. Heinz, Table of n, a(n) for n = 0..1428 (terms n = 1..50 from Don Knuth)

Don Knuth, Parades and poly-Bernoulli bijections, Mar 31 2024. See (19.2).

Crossrefs

Cf. A370961.

Row n=2 of A372254.

Sequence in context: A058895 A166842 A364770 * A231241 A138401 A099360

Adjacent sequences: A370957 A370958 A370959 * A370961 A370962 A370963

Keyword

nonn

Author

N. J. A. Sloane, Apr 04 2024

Extensions

Further terms from Don Knuth, Apr 07 2024

a(0)=14 prepended by Alois P. Heinz, Apr 17 2024

Status

approved