A190315 - cp's OEIS frontend

A190315 Central coefficients of the Riordan matrix ((1-x-x^2)/(1-2x-x^2),(x-x^2-x^3)/(1-2x-x^2)) (A190215).

n	a(n)
0	1
1	2
2	9
3	48
4	265
5	1500
6	8638
7	50360
8	296325
9	1756160
10	10467556
11	62683896
12	376838098
13	2272896626
14	13747543035
15	83354081728
16	506467851061
17	3083121435312
18	18799746616104
19	114804614071760
20	702016963933404
21	4297947201746176
22	26342178216979384

[1, 2, 9, 48, 265, 1500, 8638, 50360, 296325, 1756160, 10467556, 62683896, 376838098, 2272896626, 13747543035, 83354081728, 506467851061, 3083121435312, 18799746616104, 114804614071760, 702016963933404, 4297947201746176, 26342178216979384]

cp's OEIS Frontend

A190315 Central coefficients of the Riordan matrix ((1-x-x^2)/(1-2x-x^2),(x-x^2-x^3)/(1-2x-x^2)) (A190215).

Table of values

List of values