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A000255 as a simple table

n a(n)
0 1
1 1
2 3
3 11
4 53
5 309
6 2119
7 16687
8 148329
9 1468457
10 16019531
11 190899411
12 2467007773
13 34361893981
14 513137616783
15 8178130767479
16 138547156531409
17 2486151753313617
18 47106033220679059
19 939765362752547227
20 19690321886243846661
21 432292066866171724421

[1,1,3,11,53,309,2119,16687,148329,1468457,
 16019531,190899411,2467007773,34361893981,
 513137616783,8178130767479,138547156531409,
 2486151753313617,47106033220679059,
 939765362752547227,19690321886243846661,
 432292066866171724421]

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Last modified April 28 14:02 EDT 2024. Contains 372087 sequences. (Running on oeis4.)