A115194 - OEIS

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A115194 as a simple table

n	a(n)
0	1
1	7
2	45
3	291
4	1917
5	12867
6	87805
7	607747
8	4257789
9	30140419
10	215277565
11	1549615107
12	11230642173
13	81882660867
14	600196448253
15	4420404117507
16	32695452696573
17	242766809923587
18	1808890431799293
19	13521381274681347

[1,7,45,291,1917,12867,87805,607747,4257789, 30140419,215277565,1549615107,11230642173, 81882660867,600196448253,4420404117507, 32695452696573,242766809923587,1808890431799293, 13521381274681347]