A301396 - OEIS

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A301396 as a simple table

n	a(n)
1	0
2	4
3	13
4	78
5	446
6	2619
7	15538
8	92338
9	549096
10	3267591
11	19445455
12	115733520
13	688822904
14	4099797460
15	24401669153
16	145237096500
17	864442371855
18	5145110443481
19	30623402361787
20	182268749291468
21	1084853268325407

[0,4,13,78,446,2619,15538,92338,549096,3267591, 19445455,115733520,688822904,4099797460, 24401669153,145237096500,864442371855, 5145110443481,30623402361787,182268749291468, 1084853268325407]