G.f. A(x) satisfies a(n) = [x^n] ( A(x)^(n-1) - 2*A(x)^n + A(x)^(n+1) ) for n > 1, with a(0) = a(1) = 1.
A384264
G.f. A(x) satisfies a(n) = [x^n] ( A(x)^(n-1) - 2*A(x)^n + A(x)^(n+1) ) for n > 1, with a(0) = a(1) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =21a(5) =138a(6) =1049a(7) =8878a(8) =81802a(9) =808584a(10) =8487493a(11) =93916298a(12) =1089508229a(13) =13195281850a(14) =166288822167
External references
- oeis: A384264