A333481 - cp's OEIS frontend

A333481 a(n) = [x^n] S(x)^(2n), where S(x) = (1 - x - sqrt(1 - 6x + x^2))/(2*x) is the o.g.f. of the large Schröder numbers A006318.

n	a(n)
0	1
1	4
2	48
3	652
4	9344
5	138004
6	2077968
7	31712412
8	488793088
9	7591462564
10	118615816048
11	1862444310060
12	29361743698304
13	464472032918196
14	7368841675386960
15	117200150284494652
16	1868129273410953216
17	29834667873867329348
18	477283242733227391152
19	7647021589988643092428

[1, 4, 48, 652, 9344, 138004, 2077968, 31712412, 488793088, 7591462564, 118615816048, 1862444310060, 29361743698304, 464472032918196, 7368841675386960, 117200150284494652, 1868129273410953216, 29834667873867329348, 477283242733227391152, 7647021589988643092428]

cp's OEIS Frontend

A333481 a(n) = [x^n] S(x)^(2n), where S(x) = (1 - x - sqrt(1 - 6x + x^2))/(2*x) is the o.g.f. of the large Schröder numbers A006318.

Table of values

List of values

cp's OEIS Frontend

A333481 a(n) = [x^n] S(x)^(2*n), where S(x) = (1 - x - sqrt(1 - 6*x + x^2))/(2*x) is the o.g.f. of the large Schröder numbers A006318.

Table of values

List of values

A333481 a(n) = [x^n] S(x)^(2n), where S(x) = (1 - x - sqrt(1 - 6x + x^2))/(2*x) is the o.g.f. of the large Schröder numbers A006318.