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A015447 as a simple table

n a(n)
0 1
1 1
2 12
3 23
4 155
5 408
6 2113
7 6601
8 29844
9 102455
10 430739
11 1557744
12 6295873
13 23431057
14 92685660
15 350427287
16 1369969547
17 5224669704
18 20294334721
19 77765701465
20 301003383396
21 1156426099511
22 4467463316867
23 17188150411488

[1,1,12,23,155,408,2113,6601,29844,102455,430739,
 1557744,6295873,23431057,92685660,350427287,
 1369969547,5224669704,20294334721,77765701465,
 301003383396,1156426099511,4467463316867,
 17188150411488]

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Last modified March 18 17:51 EDT 2019. Contains 321292 sequences. (Running on oeis4.)