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A250987 as a simple table

n a(n)
1 40
2 158
3 612
4 2323
5 8726
6 32554
7 120930
8 447985
9 1656600
10 6118822
11 22583412
12 83309947
13 307230262
14 1132763986
15 4175945922
16 15393274457
17 56738968328
18 209129360814
19 770792626564
20 2840879847779
21 10470404185174
22 38589657774202

[40,158,612,2323,8726,32554,120930,447985,1656600,
 6118822,22583412,83309947,307230262,1132763986,
 4175945922,15393274457,56738968328,209129360814,
 770792626564,2840879847779,10470404185174,
 38589657774202]

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Last modified January 24 04:47 EST 2022. Contains 350534 sequences. (Running on oeis4.)