A125448 - OEIS

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A125448 as a simple table

n	a(n)
0	1
1	13
2	149
3	1597
4	18421
5	213703
6	2485463
7	28921087
8	336574029
9	3917060635
10	45587258159
11	530551444117
12	6174641413639
13	71861459611123
14	836335130323205
15	9733401730942177
16	113278883062209261
17	1318357724085097789

[1,13,149,1597,18421,213703,2485463,28921087, 336574029,3917060635,45587258159,530551444117, 6174641413639,71861459611123,836335130323205, 9733401730942177,113278883062209261, 1318357724085097789]