A074740 - cp's OEIS frontend

A074740 a(n) = n!*2^(n-1)/Product_{k=1..n} tau(k) where tau = A000005.

n	a(n)
1	1
2	2
3	6
4	16
5	80
6	240
7	1680
8	6720
9	40320
10	201600
11	2217600
12	8870400
13	115315200
14	807206400
15	6054048000
16	38745907200
17	658680422400
18	3952082534400
19	75089568153600
20	500597121024000
21	5256269770752000
22	57818967478272000
23	1329836252000256000
24	7979017512001536000

[1, 2, 6, 16, 80, 240, 1680, 6720, 40320, 201600, 2217600, 8870400, 115315200, 807206400, 6054048000, 38745907200, 658680422400, 3952082534400, 75089568153600, 500597121024000, 5256269770752000, 57818967478272000, 1329836252000256000, 7979017512001536000]

cp's OEIS Frontend

A074740 a(n) = n!*2^(n-1)/Product_{k=1..n} tau(k) where tau = A000005.

Table of values

List of values