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A131064 as a simple table

na(n)
01
12
28
324
460
5136
6292
7608
81244
92520
105076
1110192
1220428
1340904
1481860
15163776
16327612
17655288
181310644
192621360
205242796
2110485672
2220971428
2341942944
2483885980
25167772056
26335544212
27671088528
281342177164
292684354440

[1,2,8,24,60,136,292,608,1244,2520,5076,10192,
 20428,40904,81860,163776,327612,655288,1310644,
 2621360,5242796,10485672,20971428,41942944,
 83885980,167772056,335544212,671088528,1342177164,
 2684354440]