Row 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).
A190254
Row 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) =2a(2) =5a(3) =14a(4) =40a(5) =117a(6) =348a(7) =1047a(8) =3179a(9) =9723a(10) =29915a(11) =92498a(12) =287211a(13) =895030a(14) =2797928a(15) =8770635a(16) =27560288a(17) =86792100a(18) =273857035a(19) =865630975a(20) =2740541714a(21) =8689081394a(22) =27586212293a(23) =87688882320a(24) =279055280258a(25) =888981785349
External references
- oeis: A190254