Consider the 2^n compositions of n and count only those ending in an even part.
A123639
Consider the 2^n compositions of n and count only those ending in an even part.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =6a(4) =18a(5) =61a(6) =224a(7) =890a(8) =3784a(9) =17113a(10) =81950a(11) =414230a(12) =2204110a(13) =12314109a(14) =72049548a(15) =440379770a(16) =2805266692a(17) =18584809833a(18) =127812870474a(19) =910990458022
External references
- oeis: A123639