A246509 - cp's OEIS frontend

A246509 G.f.: Sum_{n>=0} x^n / (1-3x)^(2n+1) * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].

n	a(n)
0	1
1	4
2	26
3	200
4	1694
5	15224
6	141972
7	1359120
8	13264246
9	131384536
10	1316769196
11	13323636208
12	135885868780
13	1395157192624
14	14406117404584
15	149489132177440
16	1557898906160806
17	16297193704008856
18	171058624529373116
19	1800860588158214960
20	19010179617892702404
21	201164103801453466896

[1, 4, 26, 200, 1694, 15224, 141972, 1359120, 13264246, 131384536, 1316769196, 13323636208, 135885868780, 1395157192624, 14406117404584, 149489132177440, 1557898906160806, 16297193704008856, 171058624529373116, 1800860588158214960, 19010179617892702404, 201164103801453466896]

cp's OEIS Frontend

A246509 G.f.: Sum_{n>=0} x^n / (1-3x)^(2n+1) * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].

Table of values

List of values

cp's OEIS Frontend

A246509 G.f.: Sum_{n>=0} x^n / (1-3*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].

Table of values

List of values

A246509 G.f.: Sum_{n>=0} x^n / (1-3x)^(2n+1) * [Sum_{k=0..n} C(n,k)^2 * 3^k * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].