A180718 - cp's OEIS frontend

A180718 G.f.: exp( Sum_{n>=0} [ Sum_{k=0..n} C(n,k)^2x^k ]^2 x^n/n ).

n	a(n)
0	1
1	1
2	3
3	8
4	25
5	80
6	271
7	952
8	3443
9	12758
10	48212
11	185283
12	722227
13	2849955
14	11366379
15	45757142
16	185726603
17	759401542
18	3125472832
19	12939604503
20	53856950922
21	225250407802
22	946253665230
23	3991221520996
24	16897320866269
25	71782331694315

[1, 1, 3, 8, 25, 80, 271, 952, 3443, 12758, 48212, 185283, 722227, 2849955, 11366379, 45757142, 185726603, 759401542, 3125472832, 12939604503, 53856950922, 225250407802, 946253665230, 3991221520996, 16897320866269, 71782331694315]

cp's OEIS Frontend

A180718 G.f.: exp( Sum_{n>=0} [ Sum_{k=0..n} C(n,k)^2x^k ]^2 x^n/n ).

Table of values

List of values

cp's OEIS Frontend

A180718 G.f.: exp( Sum_{n>=0} [ Sum_{k=0..n} C(n,k)^2*x^k ]^2* x^n/n ).

Table of values

List of values

A180718 G.f.: exp( Sum_{n>=0} [ Sum_{k=0..n} C(n,k)^2x^k ]^2 x^n/n ).