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A203605 as a simple table

n a(n)
1 2
2 20
3 126
4 728
5 4374
6 25788
7 149794
8 866692
9 4989242
10 28600208
11 163479486
12 932166044
13 5304572502
14 30137247224
15 170986774826
16 968989758580
17 5485913976922
18 31032085382272
19 175409808771550
20 990873450379996

[2,20,126,728,4374,25788,149794,866692,4989242,
 28600208,163479486,932166044,5304572502,
 30137247224,170986774826,968989758580,
 5485913976922,31032085382272,175409808771550,
 990873450379996]

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Last modified May 3 08:32 EDT 2024. Contains 372207 sequences. (Running on oeis4.)