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A007566 as a simple table

n a(n)
0 1
1 3
2 21
3 151
4 1257
5 12651
6 151933
7 2127231
8 34035921
9 612646867
10 12252937701
11 269564629863
12 6469551117241
13 168208329048891
14 4709833213369677
15 141294996401091151
16 4521439884834917793
17 153728956084387206051
18 5534242419037939419061
19 210301211923441697925687

[1,3,21,151,1257,12651,151933,2127231,34035921,
 612646867,12252937701,269564629863,6469551117241,
 168208329048891,4709833213369677,
 141294996401091151,4521439884834917793,
 153728956084387206051,5534242419037939419061,
 210301211923441697925687]

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Last modified February 21 23:29 EST 2019. Contains 320381 sequences. (Running on oeis4.)