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A180909 as a simple table

n a(n)
1 1
2 5
3 34
4 245
5 1827
6 13875
7 106612
8 825764
9 6432933
10 50331286
11 395107108
12 3109826951
13 24529022238
14 193811775229
15 1533585360032
16 12149640848560
17 96353382257041
18 764811311969813
19 6075374239940670
20 48292524527331788

[1,5,34,245,1827,13875,106612,825764,6432933,
 50331286,395107108,3109826951,24529022238,
 193811775229,1533585360032,12149640848560,
 96353382257041,764811311969813,6075374239940670,
 48292524527331788]

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Last modified December 12 22:06 EST 2019. Contains 329963 sequences. (Running on oeis4.)