A024042 - OEIS

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A024042 as a simple table

n	a(n)
0	1
1	3
2	-48
3	-665
4	-3840
5	-14601
6	-42560
7	-101265
8	-196608
9	-269297
10	48576
11	2422743
12	13791232
13	62282055
14	260905920
15	1062351199
16	4278190080
17	17155731615
18	68685464512
19	274830861063
20	1099447627776

[1,3,-48,-665,-3840,-14601,-42560,-101265,-196608, -269297,48576,2422743,13791232,62282055,260905920, 1062351199,4278190080,17155731615,68685464512, 274830861063,1099447627776]