A336020 - cp's OEIS frontend

A336020 a(0) = a(1) = a(2) = 1; a(n) = Sum_{k=0..n-3} Stirling2(n-3,k) * a(k).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	5
7	15
8	53
9	222
10	1115
11	6698
12	47243
13	382187
14	3480048
15	35251942
16	394839407
17	4875966656
18	66282636371
19	989985346269
20	16198580140543
21	289168351452220
22	5604120791540468
23	117309414122840454
24	2639927837211705159
25	63618153549702851338

[1, 1, 1, 1, 1, 2, 5, 15, 53, 222, 1115, 6698, 47243, 382187, 3480048, 35251942, 394839407, 4875966656, 66282636371, 989985346269, 16198580140543, 289168351452220, 5604120791540468, 117309414122840454, 2639927837211705159, 63618153549702851338]

cp's OEIS Frontend

A336020 a(0) = a(1) = a(2) = 1; a(n) = Sum_{k=0..n-3} Stirling2(n-3,k) * a(k).

Table of values

List of values