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A115780 as a simple table

na(n)
02
10
24
38
414
532
660
7140
8212
9750
101322
112540
126862
1313040
1427174
1557052
16117164
17248360
18555254

[2,0,4,8,14,32,60,140,212,750,1322,2540,6862,
 13040,27174,57052,117164,248360,555254]