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A211527 as a simple table

na(n)
18
218
342
490
5192
6394
7806
81618
93244
106444
1112798
1225306
1350056
1498830
15195252
16385546
17761880
181505776
192978372
205893812
2111672100
2223128778
2345863610
2491000330
25180675314
26358921836
27713425574
281418791694
292822950098
305619290544

[8,18,42,90,192,394,806,1618,3244,6444,12798,
 25306,50056,98830,195252,385546,761880,1505776,
 2978372,5893812,11672100,23128778,45863610,
 91000330,180675314,358921836,713425574,1418791694,
 2822950098,5619290544]