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A287485 as a simple table

na(n)
12
220
368
4304
51232
65168
721408
889088
9370112
101538560
116394368
1226577664
13110464512
14459127808
151908282368
167931445248
1732965660672
18137016012800
19569483091968
202366956929024
219837842644992
2240889273090048
23169949115056128
24706363785412608
252935877583634432
2612202461910794240

[2,20,68,304,1232,5168,21408,89088,370112,1538560,
 6394368,26577664,110464512,459127808,1908282368,
 7931445248,32965660672,137016012800,569483091968,
 2366956929024,9837842644992,40889273090048,
 169949115056128,706363785412608,2935877583634432,
 12202461910794240]