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A253375 as a simple table

na(n)
181
2450
3450
42500
53111
62500
711100
822877
922631
1011100
1149284
12148389
13219438
14103572
1549284
16192474
17945748
182000385
191027387
20521009
21192474
22751689
235125790
2417316309
2510639450
265829147
271977416
28751689
292707641
3027587386
31128407497

[81,450,450,2500,3111,2500,11100,22877,22631,
 11100,49284,148389,219438,103572,49284,192474,
 945748,2000385,1027387,521009,192474,751689,
 5125790,17316309,10639450,5829147,1977416,751689,
 2707641,27587386,128407497]