G.f. A(x) satisfies: A(x) = 1 + x + x^2 * A(x/(1 - 4*x)) / (1 - 4*x).
A351050
G.f. A(x) satisfies: A(x) = 1 + x + x^2 * A(x/(1 - 4*x)) / (1 - 4*x).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =5a(4) =25a(5) =129a(6) =713a(7) =4373a(8) =30289a(9) =235041a(10) =1998001a(11) =18226117a(12) =176364969a(13) =1803064033a(14) =19463340729a(15) =221691818005
External references
- oeis: A351050