A054962 Number of different solutions to problem in A054961.

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

Offset: 0

Author

N. J. A. Sloane, May 24 2000

Keywords

• nonn
• hard
• nice
• more

References

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

Crossrefs

Cf. A304041.

Extensions

a(8) from Giovanni Resta, Mar 30 2006

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