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A231286 as a simple table

na(n)
10
20
38
476
5834
69488
7105962
81179364
913125298
10146097624
111626238194
1218101813556
13201493039018
142242839951880
1524965287273578
16277891238282180
173093236609372642
1834431142194463224
19383256667023706306

[0,0,8,76,834,9488,105962,1179364,13125298,
 146097624,1626238194,18101813556,201493039018,
 2242839951880,24965287273578,277891238282180,
 3093236609372642,34431142194463224,
 383256667023706306]