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A068605 as a simple table

na(n)
22
318
484
5300
6930
72646
87112
918360
1045990
11112530
12270204
13638820
141490762
153440430
167864080
1717825520
1840107726
1989652906
20199229060
21440401500
22968883762
232122317318
244630511064
2510066329000
2621810380150
2747110421826
28101468601612
29217969589460
30467077692570

[2,18,84,300,930,2646,7112,18360,45990,112530,
 270204,638820,1490762,3440430,7864080,17825520,
 40107726,89652906,199229060,440401500,968883762,
 2122317318,4630511064,10066329000,21810380150,
 47110421826,101468601612,217969589460,
 467077692570]