p-INVERT of A016777, where p(S) = 1 - S - S^2.

Terms

a(0) =1a(1) =6a(2) =26a(3) =111a(4) =460a(5) =1905a(6) =7910a(7) =32880a(8) =136675a(9) =568050a(10) =2360825a(11) =9811650a(12) =40777750a(13) =169474875a(14) =704348000a(15) =2927312625a(16) =12166086250a(17) =50562982500a(18) =210142784375a(19) =873366003750