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A222523 as a simple table

n a(n)
0 1
1 2
2 16
3 208
4 3930
5 97956
6 3038968
7 112911296
8 4889301222
9 241822567180
10 13450863716048
11 831128810329632
12 56483233790927556
13 4187162929534240488
14 336244786874092579920
15 29077531985735270053632
16 2694076376135933879002566
17 266245292488900189811625612
18 27956094249950913890814701248

[1,2,16,208,3930,97956,3038968,112911296,
 4889301222,241822567180,13450863716048,
 831128810329632,56483233790927556,
 4187162929534240488,336244786874092579920,
 29077531985735270053632,2694076376135933879002566,
 266245292488900189811625612,
 27956094249950913890814701248]

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Last modified January 24 17:13 EST 2022. Contains 350565 sequences. (Running on oeis4.)