A308305 - cp's OEIS frontend

A308305 a(n) = s(n,n) + s(n,n-1) + s(n,n-2), where s(n,k) are the unsigned Stirling numbers of the first kind (see A132393).

n	a(n)
1	1
2	2
3	6
4	18
5	46
6	101
7	197
8	351
9	583
10	916
11	1376
12	1992
13	2796
14	3823
15	5111
16	6701
17	8637
18	10966
19	13738
20	17006
21	20826
22	25257
23	30361
24	36203
25	42851
26	50376
27	58852
28	68356
29	78968
30	90771
31	103851
32	118297
33	134201
34	151658
35	170766
36	191626
37	214342
38	239021
39	265773
40	294711

[1, 2, 6, 18, 46, 101, 197, 351, 583, 916, 1376, 1992, 2796, 3823, 5111, 6701, 8637, 10966, 13738, 17006, 20826, 25257, 30361, 36203, 42851, 50376, 58852, 68356, 78968, 90771, 103851, 118297, 134201, 151658, 170766, 191626, 214342, 239021, 265773, 294711]

cp's OEIS Frontend

A308305 a(n) = s(n,n) + s(n,n-1) + s(n,n-2), where s(n,k) are the unsigned Stirling numbers of the first kind (see A132393).

Table of values

List of values