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A135263 as a simple table

na(n)
02
18
228
382
4244
5728
62186
76560
819684
959050
10177148
11531440
121594322
134782968
1414348908
1543046722
16129140164
17387420488
181162261466
193486784400
2010460353204
2131381059610
2294143178828
23282429536480
24847288609442

[2,8,28,82,244,728,2186,6560,19684,59050,177148,
 531440,1594322,4782968,14348908,43046722,
 129140164,387420488,1162261466,3486784400,
 10460353204,31381059610,94143178828,282429536480,
 847288609442]