A161359 Number of squares in inner rectangle described in A168339.

0, 1, 3, 4, 4, 6, 8, 7, 9, 10, 10, 12, 12, 14, 15, 16, 18, 17, 21, 20, 21, 23, 22, 24, 24, 28, 27, 28, 31, 30, 32, 31, 33, 36, 35, 36, 40, 39, 38, 40, 40, 42, 45, 44, 45, 45, 49, 48, 50, 49, 53, 52, 52, 54, 55, 56, 60, 59, 58, 60, 60, 64, 63, 66, 65, 66, 68, 67, 71, 70, 72, 71

Offset: 1

Author

R. H. Hardin and N. J. A. Sloane, Nov 27 2009

Keywords

• nonn

Crossrefs

Cf. A168339, A161369.

Formula

a(n) = A168339(n) - 2*(A161357(n)+A161358(n)) - 4.

Extensions

More terms (variables cost-2*(dimm+dimn)-4 of the C program in A168339) added by R. J. Mathar, Mar 06 2010