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A270065 as a simple table

n a(n)
0 1
1 4
2 140
3 3710
4 96176
5 2501946
6 65410388
7 1707101599
8 44538604036
9 1162378878394
10 30334909910156
11 791636651386694
12 20659194865202206
13 539139829390310029
14 14069828639020139191
15 367177676400256677129
16 9582168262012437486944
17 250064069442551102774366

[1,4,140,3710,96176,2501946,65410388,1707101599,
 44538604036,1162378878394,30334909910156,
 791636651386694,20659194865202206,
 539139829390310029,14069828639020139191,
 367177676400256677129,9582168262012437486944,
 250064069442551102774366]

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Last modified January 17 20:36 EST 2020. Contains 330987 sequences. (Running on oeis4.)