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A149491 as a simple table

n a(n)
0 1
1 1
2 4
3 14
4 56
5 237
6 1036
7 4603
8 20951
9 96544
10 448844
11 2106027
12 9950648
13 47254566
14 225457864
15 1080095458
16 5191016887
17 25019333735
18 120895386015
19 585447565802
20 2840483620046
21 13805374592905
22 67200268124866
23 327556541371822
24 1598606372758210
25 7810659910922604
26 38201283093553175
27 187014395949907268

[1,1,4,14,56,237,1036,4603,20951,96544,448844,
 2106027,9950648,47254566,225457864,1080095458,
 5191016887,25019333735,120895386015,585447565802,
 2840483620046,13805374592905,67200268124866,
 327556541371822,1598606372758210,7810659910922604,
 38201283093553175,187014395949907268]

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Last modified May 17 08:30 EDT 2022. Contains 353741 sequences. (Running on oeis4.)