A225021 - OEIS

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A225021 as a simple table

n	a(n)
1	253
2	1935
3	12641
4	113261
5	979821
6	9045373
7	82894903
8	768456167
9	7112825923
10	65968698193
11	611639117173
12	5672921683137
13	52612656431953
14	487979068798433
15	4525916701502467
16	41977528928082105
17	389337361830188511

[253,1935,12641,113261,979821,9045373,82894903, 768456167,7112825923,65968698193,611639117173, 5672921683137,52612656431953,487979068798433, 4525916701502467,41977528928082105, 389337361830188511]