A208426 - cp's OEIS frontend

A208426 Expansion of Sum_{n>=0} (3n)!/n!^3 x^(2n)/(1-3x)^(3*n+1).

n	a(n)
0	1
1	3
2	15
3	99
4	711
5	5373
6	42099
7	338355
8	2771127
9	23028813
10	193610385
11	1643215005
12	14056350075
13	121040308665
14	1048212778635
15	9122168556819
16	79727173530327
17	699443806767525
18	6156776010386481
19	54356715121718349
20	481194980656865721
21	4270165015550478003

[1, 3, 15, 99, 711, 5373, 42099, 338355, 2771127, 23028813, 193610385, 1643215005, 14056350075, 121040308665, 1048212778635, 9122168556819, 79727173530327, 699443806767525, 6156776010386481, 54356715121718349, 481194980656865721, 4270165015550478003]

cp's OEIS Frontend

A208426 Expansion of Sum_{n>=0} (3n)!/n!^3 x^(2n)/(1-3x)^(3*n+1).

Table of values

List of values

cp's OEIS Frontend

A208426 Expansion of Sum_{n>=0} (3*n)!/n!^3 * x^(2*n)/(1-3*x)^(3*n+1).

Table of values

List of values

A208426 Expansion of Sum_{n>=0} (3n)!/n!^3 x^(2n)/(1-3x)^(3*n+1).