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A168302 as a simple table

na(n)
4-8
5-66
6-264
7-689
8-1255
9-1360
10684
118502
1228842
1373150
14159588
15315549
16580723
171010768
181681640
192694636
204182204
216314574
229307264
2313429515
2419013709
2526465824
2636276980
2749036130
2865443950
2986327982
30112659084

[-8,-66,-264,-689,-1255,-1360,684,8502,28842,
 73150,159588,315549,580723,1010768,1681640,
 2694636,4182204,6314574,9307264,13429515,19013709,
 26465824,36276980,49036130,65443950,86327982,
 112659084]