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A135541 as a simple table

na(n)
00
12
27
312
421
544
691
7180
8357
9716
101435
112868
125733
1311468
1422939
1545876
1691749
17183500
18367003
19734004
201468005
212936012
225872027
2311744052
2423488101
2546976204
2693952411
27187904820
28375809637
29751619276
301503238555
313006477108

[0,2,7,12,21,44,91,180,357,716,1435,2868,5733,
 11468,22939,45876,91749,183500,367003,734004,
 1468005,2936012,5872027,11744052,23488101,
 46976204,93952411,187904820,375809637,751619276,
 1503238555,3006477108]