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A217861 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 14
5 38
6 103
7 280
8 773
9 2160
10 6053
11 17064
12 48320
13 137260
14 391091
15 1117192
16 3198217
17 9173480
18 26357393
19 75845591
20 218550709
21 630536447
22 1821184411
23 5265514692
24 15238183779
25 44136519841
26 127940010907
27 371135327740
28 1077340058523
29 3129301019091
30 7015876423459

[1,1,2,6,14,38,103,280,773,2160,6053,17064,48320,
 137260,391091,1117192,3198217,9173480,26357393,
 75845591,218550709,630536447,1821184411,
 5265514692,15238183779,44136519841,127940010907,
 371135327740,1077340058523,3129301019091,
 7015876423459]

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Last modified February 26 16:54 EST 2021. Contains 341632 sequences. (Running on oeis4.)