A227845 - cp's OEIS frontend

A227845 G.f.: Sum_{n>=0} x^n / (1-x)^(2n+1) [ Sum_{k=0..n} C(n,k)^2*x^k ]^2.

n	a(n)
0	1
1	2
2	7
3	28
4	125
5	590
6	2891
7	14536
8	74497
9	387450
10	2038743
11	10830148
12	57986773
13	312542678
14	1694166275
15	9228580464
16	50486521785
17	277239830210
18	1527533993871
19	8441627856300
20	46776754474709
21	259830443968046
22	1446468759734131
23	8068688342238328
24	45091854560015025
25	252423540736438890

[1, 2, 7, 28, 125, 590, 2891, 14536, 74497, 387450, 2038743, 10830148, 57986773, 312542678, 1694166275, 9228580464, 50486521785, 277239830210, 1527533993871, 8441627856300, 46776754474709, 259830443968046, 1446468759734131, 8068688342238328, 45091854560015025, 252423540736438890]

cp's OEIS Frontend

A227845 G.f.: Sum_{n>=0} x^n / (1-x)^(2n+1) [ Sum_{k=0..n} C(n,k)^2*x^k ]^2.

Table of values

List of values

cp's OEIS Frontend

A227845 G.f.: Sum_{n>=0} x^n / (1-x)^(2*n+1) * [ Sum_{k=0..n} C(n,k)^2*x^k ]^2.

Table of values

List of values

A227845 G.f.: Sum_{n>=0} x^n / (1-x)^(2n+1) [ Sum_{k=0..n} C(n,k)^2*x^k ]^2.