A129400 - OEIS

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A129400 as a simple table

n	a(n)
0	1
1	2
2	8
3	32
4	144
5	672
6	3264
7	16256
8	82688
9	427520
10	2240512
11	11874304
12	63533056
13	342712320
14	1861779456
15	10176823296
16	55932813312
17	308907737088
18	1713473323008
19	9541666209792
20	53322206674944
21	298943898451968

[1,2,8,32,144,672,3264,16256,82688,427520,2240512, 11874304,63533056,342712320,1861779456, 10176823296,55932813312,308907737088, 1713473323008,9541666209792,53322206674944, 298943898451968]