A254758 - OEIS

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A254758 as a simple table

n	a(n)
0	1
1	23
2	137
3	799
4	4657
5	27143
6	158201
7	922063
8	5374177
9	31322999
10	182563817
11	1064059903
12	6201795601
13	36146713703
14	210678486617
15	1227924205999
16	7156866749377
17	41713276290263
18	243122790992201
19	1417023469662943

[1,23,137,799,4657,27143,158201,922063,5374177, 31322999,182563817,1064059903,6201795601, 36146713703,210678486617,1227924205999, 7156866749377,41713276290263,243122790992201, 1417023469662943]