a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=3, a(2)=1, and a(3)=2.
A024963
a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=3, a(2)=1, and a(3)=2.
Terms
- a(0) =3a(1) =1a(2) =2a(3) =6a(4) =18a(5) =58a(6) =186a(7) =594a(8) =1898a(9) =6390a(10) =21402a(11) =71350a(12) =237522a(13) =824130a(14) =2840594a(15) =9735090a(16) =33326370a(17) =117518870a(18) =412260450a(19) =1439364870a(20) =5017074450a(21) =17912831754a(22) =63634522842a(23) =225032003602a(24) =794803982874
External references
- oeis: A024963