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A000260 as a simple table

n a(n)
0 1
1 1
2 3
3 13
4 68
5 399
6 2530
7 16965
8 118668
9 857956
10 6369883
11 48336171
12 373537388
13 2931682810
14 23317105140
15 187606350645
16 1524813969276
17 12504654858828
18 103367824774012
19 860593023907540
20 7211115497448720
21 60776550501588855

[1,1,3,13,68,399,2530,16965,118668,857956,6369883,
 48336171,373537388,2931682810,23317105140,
 187606350645,1524813969276,12504654858828,
 103367824774012,860593023907540,7211115497448720,
 60776550501588855]

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Last modified March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)