A240921 - cp's OEIS frontend

A240921 G.f.: Sum_{n>=0} n^n * x^n * (1 + nx)^n / (1 + nx + n^2*x^2)^(n+1).

n	a(n)
0	1
1	1
2	3
3	18
4	146
5	1530
6	19620
7	297360
8	5201784
9	103146120
10	2286181800
11	56011087440
12	1503057473280
13	43844234353920
14	1381310964633600
15	46743301840435200
16	1690919874777893760
17	65116170597269151360
18	2659604669692822051200
19	114838104572526535200000
20	5226654647185285702752000

[1, 1, 3, 18, 146, 1530, 19620, 297360, 5201784, 103146120, 2286181800, 56011087440, 1503057473280, 43844234353920, 1381310964633600, 46743301840435200, 1690919874777893760, 65116170597269151360, 2659604669692822051200, 114838104572526535200000, 5226654647185285702752000]

cp's OEIS Frontend

A240921 G.f.: Sum_{n>=0} n^n * x^n * (1 + nx)^n / (1 + nx + n^2*x^2)^(n+1).

Table of values

List of values

cp's OEIS Frontend

A240921 G.f.: Sum_{n>=0} n^n * x^n * (1 + n*x)^n / (1 + n*x + n^2*x^2)^(n+1).

Table of values

List of values

A240921 G.f.: Sum_{n>=0} n^n * x^n * (1 + nx)^n / (1 + nx + n^2*x^2)^(n+1).