A317567 - OEIS

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A317567 as a simple table

n	a(n)
1	4
2	30
3	170
4	997
5	5837
6	34152
7	199987
8	1170900
9	6855565
10	40139818
11	235019013
12	1376041770
13	8056757699
14	47172493014
15	276196023231
16	1617133977726
17	9468356040249
18	55437439261116
19	324587462937795
20	1900466950208836

[4,30,170,997,5837,34152,199987,1170900,6855565, 40139818,235019013,1376041770,8056757699, 47172493014,276196023231,1617133977726, 9468356040249,55437439261116,324587462937795, 1900466950208836]