A187021 - cp's OEIS frontend

A187021 Coefficient of x^n in (1 + (n+1)x + nx^2)^n.

n	a(n)
0	1
1	2
2	13
3	136
4	1921
5	33876
6	712909
7	17383584
8	481003009
9	14869654300
10	507406003501
11	18928740714192
12	765897591633409
13	33392080668673832
14	1559976990077534253
15	77717020110946293376
16	4111810085670587224065
17	230190619432401207833004
18	13591965974806603671569101

[1, 2, 13, 136, 1921, 33876, 712909, 17383584, 481003009, 14869654300, 507406003501, 18928740714192, 765897591633409, 33392080668673832, 1559976990077534253, 77717020110946293376, 4111810085670587224065, 230190619432401207833004, 13591965974806603671569101]

cp's OEIS Frontend

A187021 Coefficient of x^n in (1 + (n+1)x + nx^2)^n.

Table of values

List of values

cp's OEIS Frontend

A187021 Coefficient of x^n in (1 + (n+1)*x + n*x^2)^n.

Table of values

List of values

A187021 Coefficient of x^n in (1 + (n+1)x + nx^2)^n.