Coefficients of 1/(1-4x-16x^2)^(1/2); also, a(n) is the central coefficient of (1+2x+5x^2)^n.
A084770
Coefficients of 1/(1-4x-16x^2)^(1/2); also, a(n) is the central coefficient of (1+2x+5x^2)^n.
Terms
- a(0) =1a(1) =2a(2) =14a(3) =68a(4) =406a(5) =2332a(6) =13964a(7) =83848a(8) =509926a(9) =3118892a(10) =19194724a(11) =118654648a(12) =736365436a(13) =4584612632a(14) =28623792344a(15) =179142212368
External references
- oeis: A084770