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A018993 as a simple table

n a(n)
2 3
3 7
4 42
5 219
6 1011
7 5598
8 34646
9 224809
10 1501860
11 10113371
12 68641436
13 470506018
14 3252534733
15 22668508169
16 159249668294 

[3,7,42,219,1011,5598,34646,224809,1501860,
 10113371,68641436,470506018,3252534733,
 22668508169,159249668294]

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Last modified April 19 16:52 EDT 2024. Contains 371794 sequences. (Running on oeis4.)