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A301972 as a simple table

n a(n)
0 0
1 1
2 4
3 21
4 112
5 570
6 2772
7 13013
8 59488
9 266526
10 1175720
11 5123426
12 22108704
13 94645460
14 402503220
15 1702300725
16 7165821120
17 30043474230
18 125523450360
19 522857438070
20 2172127120800
21 9002522512620
22 37233403401480
23 153704429299746
24 633442159732032
25 2606543487445100
26 10710790748646352
27 43957192722175908

[0,1,4,21,112,570,2772,13013,59488,266526,1175720,
 5123426,22108704,94645460,402503220,1702300725,
 7165821120,30043474230,125523450360,522857438070,
 2172127120800,9002522512620,37233403401480,
 153704429299746,633442159732032,2606543487445100,
 10710790748646352,43957192722175908]

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Last modified April 24 19:24 EDT 2024. Contains 371962 sequences. (Running on oeis4.)