A376739 - OEIS

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A376739 as a simple table

n	a(n)
1	2
2	6
3	18
4	40
5	108
6	224
7	480
8	1296
9	2688
10	5760
11	12800
12	31104
13	64512
14	138240
15	286720
16	614400
17	1492992
18	3096576
19	6422528

[2,6,18,40,108,224,480,1296,2688,5760,12800,31104, 64512,138240,286720,614400,1492992,3096576, 6422528]