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A020556 as a simple table

n a(n)
0 1
1 1
2 7
3 87
4 1657
5 43833
6 1515903
7 65766991
8 3473600465
9 218310229201
10 16035686850327
11 1356791248984295
12 130660110400259849
13 14177605780945123273
14 1718558016836289502159
15 230999008481288064430879
16 34208659263890939390952225
17 5549763869122023099520756513

[1,1,7,87,1657,43833,1515903,65766991,3473600465,
 218310229201,16035686850327,1356791248984295,
 130660110400259849,14177605780945123273,
 1718558016836289502159,230999008481288064430879,
 34208659263890939390952225,
 5549763869122023099520756513]

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Last modified August 5 22:41 EDT 2021. Contains 346488 sequences. (Running on oeis4.)