a(0) = 0; for n >= 1, a(n) = 2^(n-1)*C(n-1), where C(n) = A000108(n) Catalan numbers, n>0.
A052701
a(0) = 0; for n >= 1, a(n) = 2^(n-1)*C(n-1), where C(n) = A000108(n) Catalan numbers, n>0.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =8a(4) =40a(5) =224a(6) =1344a(7) =8448a(8) =54912a(9) =366080a(10) =2489344a(11) =17199104a(12) =120393728a(13) =852017152a(14) =6085836800a(15) =43818024960a(16) =317680680960
External references
- oeis: A052701