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A061557 as a simple table

n a(n)
1 3
2 8
3 23
4 70
5 222
6 726
7 2431
8 8294
9 28730
10 100776
11 357238
12 1277788
13 4605980
14 16715250
15 61020495
16 223931910
17 825632610
18 3056887680
19 11360977650
20 42368413620
21 158498860260
22 594636663660
23 2236748680998
24 8433988655580

[3,8,23,70,222,726,2431,8294,28730,100776,357238,
 1277788,4605980,16715250,61020495,223931910,
 825632610,3056887680,11360977650,42368413620,
 158498860260,594636663660,2236748680998,
 8433988655580]

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Last modified July 16 09:13 EDT 2020. Contains 335784 sequences. (Running on oeis4.)