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

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

Offset: 1

Author

N. J. A. Sloane, Dec 17 2013

Keywords

• nonn
• more
• hard

Links

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

Crossrefs

Cf. A005271.