A037964 - OEIS

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A037964 as a simple table

n	a(n)
0	0
1	4
2	32
3	472
4	6400
5	92504
6	1351616
7	20060016
8	300533760
9	4537591960
10	68923172032
11	1052049834576
12	16123800489472
13	247959271674352
14	3824345280321920
15	59132290859989472
16	916312070170755072

[0,4,32,472,6400,92504,1351616,20060016,300533760, 4537591960,68923172032,1052049834576, 16123800489472,247959271674352,3824345280321920, 59132290859989472,916312070170755072]