A086880 - cp's OEIS frontend

A086880 a(n) = floor( sum(k=0, infinity, k^n/(k!)^2 ) ); related to generalized Bell numbers.

n	a(n)
0	2
1	1
2	2
3	3
4	7
5	17
6	45
7	128
8	391
9	1287
10	4524
11	16889
12	66657
13	276982
14	1207598
15	5507362
16	26203307
17	129757596
18	667358910
19	3558097578
20	19632277761
21	111930731957
22	658482495614
23	3992062349412
24	24911272290567
25	159833355923362

[2, 1, 2, 3, 7, 17, 45, 128, 391, 1287, 4524, 16889, 66657, 276982, 1207598, 5507362, 26203307, 129757596, 667358910, 3558097578, 19632277761, 111930731957, 658482495614, 3992062349412, 24911272290567, 159833355923362]

cp's OEIS Frontend

A086880 a(n) = floor( sum(k=0, infinity, k^n/(k!)^2 ) ); related to generalized Bell numbers.

Table of values

List of values