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A151221 as a simple table

n a(n)
0 1
1 3
2 13
3 56
4 261
5 1217
6 5840
7 28054
8 136500
9 665095
10 3262019
11 16019624
12 78964457
13 389662206
14 1927208588
15 9540241539
16 47296361760
17 234644582104
18 1165274537131
19 5790262668523
20 28792387039035
21 143238480133025
22 712967353330466
23 3550119333864871
24 17684346785224752
25 88118584574284144

[1,3,13,56,261,1217,5840,28054,136500,665095,
 3262019,16019624,78964457,389662206,1927208588,
 9540241539,47296361760,234644582104,1165274537131,
 5790262668523,28792387039035,143238480133025,
 712967353330466,3550119333864871,
 17684346785224752,88118584574284144]

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Last modified September 22 21:38 EDT 2020. Contains 337291 sequences. (Running on oeis4.)