A004048 - OEIS

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A004048 as a simple table

n	a(n)
0	1
1	0
2	756
3	8736
4	44226
5	187488
6	531468
7	1314144
8	3097332
9	6141408
10	10968048
11	21258720
12	34038186
13	53778816
14	88943400
15	131804064
16	184024386
17	289650816
18	387420516
19	524343456
20	756139104
21	992308512

[1,0,756,8736,44226,187488,531468,1314144,3097332, 6141408,10968048,21258720,34038186,53778816, 88943400,131804064,184024386,289650816,387420516, 524343456,756139104,992308512]