A180911 - OEIS

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A180911 as a simple table

n	a(n)
1	1
2	7
3	69
4	728
5	7996
6	89712
7	1020651
8	11723768
9	135611317
10	1576988939
11	18414581185
12	215742738765
13	2534467738774
14	29840979652015
15	352014007477710
16	4159154152175656
17	49209645681971673
18	582929349589746292

[1,7,69,728,7996,89712,1020651,11723768,135611317, 1576988939,18414581185,215742738765,2534467738774, 29840979652015,352014007477710,4159154152175656, 49209645681971673,582929349589746292]