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A003148 as a simple table

n a(n)
0 1
1 1
2 7
3 27
4 321
5 2265
6 37575
7 390915
8 8281665
9 114610545
10 2946939975
11 51083368875
12 1542234996225
13 32192256321225
14 1114841223671175
15 27254953356505875
16 1064057291370698625
17 29845288035840902625
18 1296073464766972266375
19 41049997128507054562875

[1,1,7,27,321,2265,37575,390915,8281665,114610545,
 2946939975,51083368875,1542234996225,
 32192256321225,1114841223671175,27254953356505875,
 1064057291370698625,29845288035840902625,
 1296073464766972266375,41049997128507054562875]

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Last modified December 10 21:53 EST 2019. Contains 329909 sequences. (Running on oeis4.)