A336021 - cp's OEIS frontend

A336021 a(0) = ... = a(3) = 1; a(n) = Sum_{k=0..n-4} Stirling2(n-4,k) * a(k).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	2
7	5
8	15
9	52
10	204
11	902
12	4532
13	26196
14	175320
15	1351296
16	11819348
17	115309534
18	1236465988
19	14419850138
20	181652022376
21	2462053028798
22	35834756184146
23	559816444117400
24	9389648056139010
25	169166236946379128
26	3273760080403458226
27	67994123544008546820

[1, 1, 1, 1, 1, 1, 2, 5, 15, 52, 204, 902, 4532, 26196, 175320, 1351296, 11819348, 115309534, 1236465988, 14419850138, 181652022376, 2462053028798, 35834756184146, 559816444117400, 9389648056139010, 169166236946379128, 3273760080403458226, 67994123544008546820]

cp's OEIS Frontend

A336021 a(0) = ... = a(3) = 1; a(n) = Sum_{k=0..n-4} Stirling2(n-4,k) * a(k).

Table of values

List of values