A037753 - OEIS

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A037753 as a simple table

n	a(n)
1	2
2	15
3	91
4	546
5	3278
6	19671
7	118027
8	708162
9	4248974
10	25493847
11	152963083
12	917778498
13	5506670990
14	33040025943
15	198240155659
16	1189440933954
17	7136645603726
18	42819873622359
19	256919241734155
20	1541515450404930

[2,15,91,546,3278,19671,118027,708162,4248974, 25493847,152963083,917778498,5506670990, 33040025943,198240155659,1189440933954, 7136645603726,42819873622359,256919241734155, 1541515450404930]