A027149 a(n) = A027144(2n-1, n-2).

1, 10, 42, 352, 1360, 11616, 43680, 381952, 1416960, 12620800, 46441472, 419512320, 1535352832, 14021353472, 51117465600, 470886645760, 1711716106240, 15879295991808, 57592095965184, 537381547540480, 1945481074704384

Offset: 2

Author

Clark Kimberling

Keywords

• nonn