A166990 - cp's OEIS frontend

A166990 G.f.: A(x) = exp( Sum_{n>=1} A000172(n)*x^n/n ) where Franel number A000172(n) = Sum_{k=0..n} C(n,k)^3.

n	a(n)
0	1
1	2
2	7
3	30
4	147
5	786
6	4472
7	26644
8	164477
9	1044258
10	6782484
11	44887236
12	301782361
13	2056250570
14	14172792355
15	98667874038
16	692948001906
17	4904403499992
18	34951124337300
19	250617829087656
20	1807055528439771
21	13095146839953030

[1, 2, 7, 30, 147, 786, 4472, 26644, 164477, 1044258, 6782484, 44887236, 301782361, 2056250570, 14172792355, 98667874038, 692948001906, 4904403499992, 34951124337300, 250617829087656, 1807055528439771, 13095146839953030]

cp's OEIS Frontend

A166990 G.f.: A(x) = exp( Sum_{n>=1} A000172(n)*x^n/n ) where Franel number A000172(n) = Sum_{k=0..n} C(n,k)^3.

Table of values

List of values