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A150070 as a simple table

na(n)
01
12
26
318
464
5220
6782
72824
810328
938306
10142388
11533832
122011048
137609034
1428938148
15110276428
16421716538
171616589438
186211475088
1923925481704
2092285891638
21356644978016
221380284689858
235349558200316
2420763135142878
2580668088650424
26313779804455788
271221721443853960
284761378554236090

[1,2,6,18,64,220,782,2824,10328,38306,142388,
 533832,2011048,7609034,28938148,110276428,
 421716538,1616589438,6211475088,23925481704,
 92285891638,356644978016,1380284689858,
 5349558200316,20763135142878,80668088650424,
 313779804455788,1221721443853960,4761378554236090]