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A149994 as a simple table

na(n)
01
12
25
317
459
5214
6803
73056
811895
947004
10187667
11756321
123069385
1312542846
1451578053
15213150329
16884724627
173686093838
1815410995185
1964642971735
20271932636847
211146871941694
224848125819247
2320538011410752
2487180357318349
25370753442344240
261579383361624263
276738572455070115

[1,2,5,17,59,214,803,3056,11895,47004,187667,
 756321,3069385,12542846,51578053,213150329,
 884724627,3686093838,15410995185,64642971735,
 271932636847,1146871941694,4848125819247,
 20538011410752,87180357318349,370753442344240,
 1579383361624263,6738572455070115]