A316310 - OEIS

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A316310 as a simple table

n	a(n)
1	21
2	127
3	168
4	1046
5	4583
6	17487
7	96175
8	534083
9	2689151
10	15357780
11	89959730
12	517714307
13	3063955854
14	18343096898
15	109721387508
16	660612374692
17	3991562407488
18	24145509389500
19	146334159352398
20	887846840631706

[21,127,168,1046,4583,17487,96175,534083,2689151, 15357780,89959730,517714307,3063955854, 18343096898,109721387508,660612374692, 3991562407488,24145509389500,146334159352398, 887846840631706]