A246813 - cp's OEIS frontend

A246813 G.f.: Sum_{n>=0} x^n / (1-3x)^(2n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k].

n	a(n)
0	1
1	4
2	23
3	152
4	1085
5	8156
6	63579
7	509136
8	4161649
9	34566580
10	290798551
11	2471871784
12	21191824645
13	182984610220
14	1589620392835
15	13881368684128
16	121767703088377
17	1072382299895428
18	9477296423786207
19	84017470425706040
20	746903374745524629
21	6656552616997851036
22	59459592374756968323

[1, 4, 23, 152, 1085, 8156, 63579, 509136, 4161649, 34566580, 290798551, 2471871784, 21191824645, 182984610220, 1589620392835, 13881368684128, 121767703088377, 1072382299895428, 9477296423786207, 84017470425706040, 746903374745524629, 6656552616997851036, 59459592374756968323]

cp's OEIS Frontend

A246813 G.f.: Sum_{n>=0} x^n / (1-3x)^(2n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k].

Table of values

List of values

cp's OEIS Frontend

A246813 G.f.: Sum_{n>=0} x^n / (1-3*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k].

Table of values

List of values

A246813 G.f.: Sum_{n>=0} x^n / (1-3x)^(2n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k].