A024057 - OEIS

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A024057 as a simple table

n	a(n)
0	1
1	4
2	-231
3	-6436
4	-64911
5	-387500
6	-1663991
7	-5686676
8	-16386591
9	-41093596
10	-90234375
11	-165530756
12	-185841071
13	404972404
14	4627726569
15	27954687500
16	148292923329
17	755963695684
18	3803677305049
19	19056502765084

[1,4,-231,-6436,-64911,-387500,-1663991,-5686676, -16386591,-41093596,-90234375,-165530756, -185841071,404972404,4627726569,27954687500, 148292923329,755963695684,3803677305049, 19056502765084]