Diagonal sums of the Riordan matrix (g(x),x*g(x)), where g(x) = (1-x-sqrt(1-2*x-3*x^2-4*x^3))/(2*x^2*(1+x)) (A190252).
A190255
Diagonal sums of the Riordan matrix (g(x),x*g(x)), where g(x) = (1-x-sqrt(1-2*x-3*x^2-4*x^3))/(2*x^2*(1+x)) (A190252).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =18a(5) =48a(6) =131a(7) =365a(8) =1034a(9) =2968a(10) =8615a(11) =25243a(12) =74565a(13) =221807a(14) =663869a(15) =1997765a(16) =6040894a(17) =18345668a(18) =55931289a(19) =171121717a(20) =525225943a(21) =1616805005a(22) =4990386995a(23) =15441275375a(24) =47887524320a(25) =148826022290a(26) =463433496815
External references
- oeis: A190255