A054962 Number of different solutions to problem in A054961.

1, 1, 1, 1, 1, 13, 120, 1680, 4200, 181440

Offset

0,6

References

Initial terms computed by Michael B. Greenwald (mbgreen(AT)central.cis.upenn.edu), May 24 2000.

Links

Table of n, a(n) for n=0..9.

Crossrefs

Cf. A304041.

Sequence in context: A295048 A295376 A188709 * A297394 A014918 A081033

Adjacent sequences: A054959 A054960 A054961 * A054963 A054964 A054965

Keyword

nonn,hard,nice,more

Author

N. J. A. Sloane, May 24 2000

Extensions

a(8) from Giovanni Resta, Mar 30 2006

a(9) from Zhao Hui Du, Mar 29 2018

Status

approved