Modulo 2 recursion switch between A000898 and A121966: A000898 first.
A122018
Modulo 2 recursion switch between A000898 and A121966: A000898 first.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =2a(4) =40a(5) =32a(6) =464a(7) =272a(8) =7040a(9) =4864a(10) =136448a(11) =87808a(12) =3177472a(13) =2123776a(14) =86861824a(15) =57128960a(16) =2720112640a(17) =1806049280a(18) =96095928320a(19) =63587041280
External references
- oeis: A122018