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A047139 as a simple table

n a(n)
0 1
1 2
2 9
3 48
4 261
5 1534
6 9319
7 56808
8 353362
9 2227380
10 14099553
11 89931668
12 577292621
13 3718701300
14 24047442913
15 156059054586
16 1015345651345
17 6621929417524
18 43283675452318
19 283439130488986
20 1859169844171611 

[1,2,9,48,261,1534,9319,56808,353362,2227380,
 14099553,89931668,577292621,3718701300,
 24047442913,156059054586,1015345651345,
 6621929417524,43283675452318,283439130488986,
 1859169844171611]

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Last modified June 16 08:45 EDT 2024. Contains 373424 sequences. (Running on oeis4.)