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A118971 as a simple table

n a(n)
0 1
1 4
2 26
3 204
4 1771
5 16380
6 158224
7 1577532
8 16112057
9 167710664
10 1772645420
11 18974357220
12 205263418941
13 2240623268512
14 24648785802336
15 272994644359580
16 3041495503591365
17 34064252968167180
18 383302465665133014

[1,4,26,204,1771,16380,158224,1577532,16112057,
 167710664,1772645420,18974357220,205263418941,
 2240623268512,24648785802336,272994644359580,
 3041495503591365,34064252968167180,
 383302465665133014]

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Last modified May 26 13:05 EDT 2019. Contains 323586 sequences. (Running on oeis4.)