a(n) = T(2n,n-1), T given by A026670. Also T(2n,n-1)=T(2n+1,n+2), T given by A026725; and T(2n,n-1), T given by A026736.
A026672
a(n) = T(2n,n-1), T given by A026670. Also T(2n,n-1)=T(2n+1,n+2), T given by A026725; and T(2n,n-1), T given by A026736.
Terms
- a(0) =1a(1) =5a(2) =22a(3) =94a(4) =398a(5) =1680a(6) =7085a(7) =29877a(8) =126021a(9) =531751a(10) =2244627a(11) =9478605a(12) =40040183a(13) =169193597a(14) =715143046a(15) =3023492646a(16) =12785541850a(17) =54076955716a(18) =228759017624a(19) =967850695362
External references
- oeis: A026672