a(0) = 1; for n>0, a(n) = 2*(n+2)*4^(n-2)-(n/4)*((3-4*n)/(1-2*n))*binomial(2*n,n).
A122122
a(0) = 1; for n>0, a(n) = 2*(n+2)*4^(n-2)-(n/4)*((3-4*n)/(1-2*n))*binomial(2*n,n).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =62a(5) =301a(6) =1450a(7) =6882a(8) =32156a(9) =148093a(10) =673394a(11) =3028246a(12) =13487908a(13) =59577298a(14) =261255012a(15) =1138378276a(16) =4932592056a(17) =21267076637a(18) =91289277250a(19) =390312067278
External references
- oeis: A122122