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A011819 as a simple table

na(n)
12
25
316
452
5152
6392
7904
81899
93694
106743
1111672
1219318
1330772
1447426
1571024
16103717
17148122
18207385
19285248
20386120
21515152
22678316
23882488
241135535
251446406
261825227
272283400
282833706
293490412
304269382
315188192
326266249

[2,5,16,52,152,392,904,1899,3694,6743,11672,19318,
 30772,47426,71024,103717,148122,207385,285248,
 386120,515152,678316,882488,1135535,1446406,
 1825227,2283400,2833706,3490412,4269382,5188192,
 6266249]