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A131764 as a simple table

n a(n)
0 1
1 2
2 3
3 10
4 30
5 102
6 335
7 1170
8 4080
9 14560
10 52377
11 190650
12 698870
13 2581110
14 9586395
15 35791358
16 134215680
17 505290270
18 1908866960
19 7233629130
20 27487764474
21 104715392730
22 399822314775
23 1529755308210
24 5864061663920
25 22517998136832
26 86607683851185
27 333599972392960
28 1286742745883790
29 4969489243995030
30 19215358392200893
31 74382032555280450
32 288230376084602880

[1,2,3,10,30,102,335,1170,4080,14560,52377,190650,
 698870,2581110,9586395,35791358,134215680,
 505290270,1908866960,7233629130,27487764474,
 104715392730,399822314775,1529755308210,
 5864061663920,22517998136832,86607683851185,
 333599972392960,1286742745883790,4969489243995030,
 19215358392200893,74382032555280450,
 288230376084602880]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)