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A187021 as a simple table

n a(n)
0 1
1 2
2 13
3 136
4 1921
5 33876
6 712909
7 17383584
8 481003009
9 14869654300
10 507406003501
11 18928740714192
12 765897591633409
13 33392080668673832
14 1559976990077534253
15 77717020110946293376
16 4111810085670587224065
17 230190619432401207833004
18 13591965974806603671569101

[1,2,13,136,1921,33876,712909,17383584,481003009,
 14869654300,507406003501,18928740714192,
 765897591633409,33392080668673832,
 1559976990077534253,77717020110946293376,
 4111810085670587224065,230190619432401207833004,
 13591965974806603671569101]

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Last modified November 12 09:29 EST 2019. Contains 329054 sequences. (Running on oeis4.)