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A002905 as a simple table

n a(n)
0 1
1 1
2 1
3 3
4 5
5 12
6 30
7 79
8 227
9 710
10 2322
11 8071
12 29503
13 112822
14 450141
15 1867871
16 8037472
17 35787667
18 164551477
19 779945969
20 3804967442
21 19079312775
22 98211456209
23 518397621443
24 2802993986619
25 15510781288250
26 87765472487659
27 507395402140211
28 2994893000122118
29 18035546081743772
30 110741792670074054
31 692894304050453139

[1,1,1,3,5,12,30,79,227,710,2322,8071,29503,
 112822,450141,1867871,8037472,35787667,164551477,
 779945969,3804967442,19079312775,98211456209,
 518397621443,2802993986619,15510781288250,
 87765472487659,507395402140211,2994893000122118,
 18035546081743772,110741792670074054,
 692894304050453139]

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Last modified April 24 10:49 EDT 2024. Contains 371935 sequences. (Running on oeis4.)