A101821 - cp's OEIS frontend

A101821 Triangle read by rows: T(n,h) = number of functions f:{1,2,...,n}->{1,2,...,n-2} such that |Image(f)|=h, h=1,2,...,n-2; n=3,4,....

n	a(n)
0	2
1	3
2	42
3	4
4	180
5	600
6	5
7	620
8	5400
9	7800
10	6
11	1890
12	36120
13	126000
14	100800
15	7
16	5534
17	202860
18	1428840
19	2646000
20	1340640
21	8
22	14280
23	1016400
24	13053600
25	46710720
26	53343360
27	18627840
28	9
29	36792
30	4702320
31	103133520
32	642978000
33	1380576960

[2, 3, 42, 4, 180, 600, 5, 620, 5400, 7800, 6, 1890, 36120, 126000, 100800, 7, 5534, 202860, 1428840, 2646000, 1340640, 8, 14280, 1016400, 13053600, 46710720, 53343360, 18627840, 9, 36792, 4702320, 103133520, 642978000, 1380576960]

cp's OEIS Frontend

A101821 Triangle read by rows: T(n,h) = number of functions f:{1,2,...,n}->{1,2,...,n-2} such that |Image(f)|=h, h=1,2,...,n-2; n=3,4,....

Table of values

List of values