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A308585 as a simple table

na(n)
10
26
328
482
5200
6446
7948
81962
94000
108086
1116268
1232642
1365400
14130926
15261988
16524122
171048400
182096966
194194108
208388402
2116777000
2233554206
2367108628
24134217482
25268435200
26536870646
271073741548
282147483362
294294967000
308589934286
3117179868868
3234359738042

[0,6,28,82,200,446,948,1962,4000,8086,16268,32642,
 65400,130926,261988,524122,1048400,2096966,
 4194108,8388402,16777000,33554206,67108628,
 134217482,268435200,536870646,1073741548,
 2147483362,4294967000,8589934286,17179868868,
 34359738042]