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A258733 as a simple table

na(n)
1256
2840
32028
44184
57834
613720
722866
836656
956925
1086064
11127140
12184032
13261584
14365776
15503914
16684840
17919163
181219512
191600812
202080584
212679270
223420584
234331890
245444608
256794649
268422880
2710375620
2812705168
2915470364

[256,840,2028,4184,7834,13720,22866,36656,56925,
 86064,127140,184032,261584,365776,503914,684840,
 919163,1219512,1600812,2080584,2679270,3420584,
 4331890,5444608,6794649,8422880,10375620,12705168,
 15470364]