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A148860 as a simple table

n a(n)
0 1
1 1
2 3
3 8
4 28
5 96
6 349
7 1294
8 4928
9 19203
10 76086
11 305502
12 1242251
13 5100276
14 21134073
15 88267969
16 371224527
17 1571306552
18 6688704784
19 28618871601
20 123033231031
21 531189061092
22 2302467195000
23 10016716673010
24 43723850494820
25 191458643525064
26 840812942650704
27 3702591477065075
28 16346395729010517

[1,1,3,8,28,96,349,1294,4928,19203,76086,305502,
 1242251,5100276,21134073,88267969,371224527,
 1571306552,6688704784,28618871601,123033231031,
 531189061092,2302467195000,10016716673010,
 43723850494820,191458643525064,840812942650704,
 3702591477065075,16346395729010517]

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Last modified September 25 00:48 EDT 2020. Contains 337333 sequences. (Running on oeis4.)