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A254533 as a simple table

na(n)
12
23
38
420
550
6126
7329
8956
92897
108341
1123238
1266544
13194686
14555838
151532445
164225095
1712140873
1836623429
19112964359
20345148105
211027400959
222988415841
238604041257
2424715209608
2570743541258
26201532200098
27575286723544

[2,3,8,20,50,126,329,956,2897,8341,23238,66544,
 194686,555838,1532445,4225095,12140873,36623429,
 112964359,345148105,1027400959,2988415841,
 8604041257,24715209608,70743541258,201532200098,
 575286723544]