A233001 a(n) = A005271(n)^2.

1, 4, 81, 73984, 347138964225, 266749070875738835911704576, 153420859074097275505001068428834200016791982521508695409921

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Daryl DeFord, Seating rearrangements on arbitrary graphs, Involve, Vol. 7 (2014), No. 6, 787-805. See Table 3.

Crossrefs

Cf. A005271.

Sequence in context: A357513 A090599 A133396 * A357781 A318868 A289224

Adjacent sequences: A232998 A232999 A233000 * A233002 A233003 A233004

Keyword

nonn,more,hard

Author

N. J. A. Sloane, Dec 17 2013

Status

approved