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A022191 as a simple table

n a(n)
8 1
9 511
10 174251
11 50955971
12 13910980083
13 3675639930963
14 955841412523283
15 246614610741341843
16 63379954960524853651
17 16256896431763117598611
18 4165817792093527797314451
19 1066968301301093995246996371
20 273210326382611632738979052435

[1,511,174251,50955971,13910980083,3675639930963,
 955841412523283,246614610741341843,
 63379954960524853651,16256896431763117598611,
 4165817792093527797314451,
 1066968301301093995246996371,
 273210326382611632738979052435]

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Last modified February 24 17:29 EST 2020. Contains 332209 sequences. (Running on oeis4.)