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A001007 as a simple table

n a(n)
3 1
4 2
5 15
6 42
7 421
8 1331
9 15119
10 618765
11 2155578
12 98032875
13 1290154807
14 4682196239
15 63117678751
16 3186252107917
17 164886529617695
18 616630679090258
19 32763760653353135
20 467443761039641135
21 1768227793278781667
22 96699391743949360451
23 1402535447576150395335

[1,2,15,42,421,1331,15119,618765,2155578,98032875,
 1290154807,4682196239,63117678751,3186252107917,
 164886529617695,616630679090258,32763760653353135,
 467443761039641135,1768227793278781667,
 96699391743949360451,1402535447576150395335]

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Last modified October 19 16:07 EDT 2018. Contains 316366 sequences. (Running on oeis4.)