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A148456 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 18
5 55
6 187
7 665
8 2404
9 8914
10 33984
11 131733
12 517871
13 2062976
14 8320703
15 33890091
16 139284855
17 577018589
18 2408280217
19 10116043988
20 42749394792
21 181625736257
22 775565368155
23 3326762767141
24 14331173453690
25 61976013148146
26 269005365757008
27 1171533077777764
28 5118392288259919

[1,1,2,6,18,55,187,665,2404,8914,33984,131733,
 517871,2062976,8320703,33890091,139284855,
 577018589,2408280217,10116043988,42749394792,
 181625736257,775565368155,3326762767141,
 14331173453690,61976013148146,269005365757008,
 1171533077777764,5118392288259919]

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Last modified May 9 13:42 EDT 2021. Contains 343742 sequences. (Running on oeis4.)