A248836 - OEIS

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A248836 as a simple table

n	a(n)
1	2
2	6
3	22
4	96
5	482
6	2736
7	17302
8	120576
9	917762
10	7574016
11	67354582
12	642041856
13	6530291042
14	70589700096
15	808090395862
16	9766250151936
17	124258689304322
18	1660195646078976
19	23239748527125142
20	340125128186658816

[2,6,22,96,482,2736,17302,120576,917762,7574016, 67354582,642041856,6530291042,70589700096, 808090395862,9766250151936,124258689304322, 1660195646078976,23239748527125142, 340125128186658816]