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A028270 as a simple table

na(n)
01
13
28
326
490
5322
61176
74356
816302
961490
10233376
11890188
123409588
1313104756
1450517200
15195234120
16756197910
172934686610
1811408741520
1944420399100
20173191792620
21676104403260
222642356838160
2310337529691320
2440481034410700

[1,3,8,26,90,322,1176,4356,16302,61490,233376,
 890188,3409588,13104756,50517200,195234120,
 756197910,2934686610,11408741520,44420399100,
 173191792620,676104403260,2642356838160,
 10337529691320,40481034410700]