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A151318 as a simple table

n a(n)
0 1
1 3
2 13
3 55
4 249
5 1131
6 5253
7 24543
8 115825
9 549331
10 2620029
11 12543367
12 60270697
13 290423355
14 1403088885
15 6793370415
16 32956254945
17 160152588195
18 779470975725
19 3798948989655
20 18538237315545
21 90565618791435
22 442899758973285
23 2167985089576575
24 10621425660150609
25 52078139149834611
26 255533719072119133

[1,3,13,55,249,1131,5253,24543,115825,549331,
 2620029,12543367,60270697,290423355,1403088885,
 6793370415,32956254945,160152588195,779470975725,
 3798948989655,18538237315545,90565618791435,
 442899758973285,2167985089576575,
 10621425660150609,52078139149834611,
 255533719072119133]

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Last modified August 13 22:46 EDT 2020. Contains 336473 sequences. (Running on oeis4.)