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A211497 as a simple table

n a(n)
1 40
2 180
3 808
4 3636
5 16396
6 74104
7 335660
8 1523420
9 6925768
10 31527492
11 143656108
12 654965928
13 2986993420
14 13622286844
15 62110476152
16 283072002980
17 1289383564204
18 5869109209272
19 26695147549612
20 121321864635996
21 550906942638568

[40,180,808,3636,16396,74104,335660,1523420,
 6925768,31527492,143656108,654965928,2986993420,
 13622286844,62110476152,283072002980,
 1289383564204,5869109209272,26695147549612,
 121321864635996,550906942638568]

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Last modified June 30 18:52 EDT 2022. Contains 354945 sequences. (Running on oeis4.)