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A018035 as a simple table

na(n)
01
13
28
320
455
5148
6400
71086
82948
98000
1021716
1158945
12160000
13434307
141178891
153200000
168686137
1723577802
1864000000
19173722728
20471556032
211280000000
223474454550
239431120637
2425600000000
2569489090985
26188622412731
27512000000000
281389781819697

[1,3,8,20,55,148,400,1086,2948,8000,21716,58945,
 160000,434307,1178891,3200000,8686137,23577802,
 64000000,173722728,471556032,1280000000,
 3474454550,9431120637,25600000000,69489090985,
 188622412731,512000000000,1389781819697]