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A251839 as a simple table

na(n)
1981
2508
3828
41229
52672
65438
79647
822610
947398
1086279
11204832
12432320
13789967
141882338
153983708
167285937
1717386988
1836844782
1967409449
20160977268
21341342946
22624601177
231492090228
243164874902
255791630811
2613837769762
2729355806776

[981,508,828,1229,2672,5438,9647,22610,47398,
 86279,204832,432320,789967,1882338,3983708,
 7285937,17386988,36844782,67409449,160977268,
 341342946,624601177,1492090228,3164874902,
 5791630811,13837769762,29355806776]