A049647 a(n) = T(n,n+2), array T given by A049639.

1, 1, 4, 4, 7, 7, 11, 11, 17, 17, 23, 23, 31, 31, 41, 41, 51, 51, 61, 61, 75, 75, 89, 89, 105, 105, 123, 123, 137, 137, 153, 153, 177, 177, 199, 199, 223, 223, 249, 249, 269, 269, 291, 291, 323, 323, 353, 353, 381, 381, 413, 413, 443, 443, 473, 473, 513, 513

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Extensions

More terms from Sean A. Irvine, Aug 06 2021