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A151391 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 16
5 45
6 142
7 452
8 1429
9 4706
10 15830
11 53092
12 180380
13 622747
14 2155976
15 7495821
16 26308397
17 92778770
18 327973373
19 1165333486
20 4159080037
21 14877633175
22 53376247653
23 192149069209
24 693285668555
25 2506469460691
26 9083812061880
27 32988452185659
28 119995516195356
29 437257636411965
30 1596078045075818

[1,1,2,6,16,45,142,452,1429,4706,15830,53092,
 180380,622747,2155976,7495821,26308397,92778770,
 327973373,1165333486,4159080037,14877633175,
 53376247653,192149069209,693285668555,
 2506469460691,9083812061880,32988452185659,
 119995516195356,437257636411965,1596078045075818]

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Last modified May 4 15:13 EDT 2024. Contains 372254 sequences. (Running on oeis4.)