A255839 - cp's OEIS frontend

A255839 G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..3n} binomial(3n,k)^2 * x^k] / A(x)^n * x^n/n ).

n	a(n)
0	1
1	1
2	9
3	18
4	64
5	172
6	477
7	1368
8	3681
9	10485
10	28701
11	80829
12	225090
13	632160
14	1778553
15	5010948
16	14181849
17	40161357
18	114151716
19	324873027
20	926918784
21	2649218580
22	7585705665
23	21758756931
24	62508649059
25	179859399129
26	518234494662
27	1495275239115
28	4319808231645
29	12495043092609
30	36183457564425

[1, 1, 9, 18, 64, 172, 477, 1368, 3681, 10485, 28701, 80829, 225090, 632160, 1778553, 5010948, 14181849, 40161357, 114151716, 324873027, 926918784, 2649218580, 7585705665, 21758756931, 62508649059, 179859399129, 518234494662, 1495275239115, 4319808231645, 12495043092609, 36183457564425]

cp's OEIS Frontend

A255839 G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..3n} binomial(3n,k)^2 * x^k] / A(x)^n * x^n/n ).

Table of values

List of values

cp's OEIS Frontend

A255839 G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..3*n} binomial(3*n,k)^2 * x^k] / A(x)^n * x^n/n ).

Table of values

List of values

A255839 G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..3n} binomial(3n,k)^2 * x^k] / A(x)^n * x^n/n ).