p-INVERT of the odd positive integers, where p(S) = 1 - S + S^2 - S^3.

Terms

a(0) =1a(1) =3a(2) =5a(3) =8a(4) =22a(5) =100a(6) =444a(7) =1680a(8) =5496a(9) =16096a(10) =43936a(11) =117360a(12) =323056a(13) =946288a(14) =2930320a(15) =9287792a(16) =29222800a(17) =89856944a(18) =269619792a(19) =795460592a(20) =2334102160a(21) =6882700336a(22) =20508738256a(23) =61728245104a(24) =186833742864a(25) =565643533232