A237856 - OEIS

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A237856 as a simple table

n	a(n)
1	21
2	325
3	3373
4	31651
5	315896
6	3255233
7	33328972
8	338653847
9	3440498469
10	35005538562
11	356277110111
12	3625220129423
13	36883657486461
14	375271668222454
15	3818293078009309
16	38850130701960925
17	395287712822929199

[21,325,3373,31651,315896,3255233,33328972, 338653847,3440498469,35005538562,356277110111, 3625220129423,36883657486461,375271668222454, 3818293078009309,38850130701960925, 395287712822929199]