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A078678 as a simple table

na(n)
01
12
24
38
418
542
6100
7242
8592
91460
103624
119042
1222656
1356970
14143688
15363348
16920886
172338566
185949148
1915157874
2038674978
2198803052
22252701484
23646990518
241658066668
254252908542
2610917422860
2728046438252
2872099983802
29185469011130
30477383400300

[1,2,4,8,18,42,100,242,592,1460,3624,9042,22656,
 56970,143688,363348,920886,2338566,5949148,
 15157874,38674978,98803052,252701484,646990518,
 1658066668,4252908542,10917422860,28046438252,
 72099983802,185469011130,477383400300]