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A270466 as a simple table

na(n)
01
18
240
3180
4820
53452
614520
757880
8230484
9919432
103673908
1114687560
1258735284
13234910792
14939583668
153758215240

[1,8,40,180,820,3452,14520,57880,230484,919432,
 3673908,14687560,58735284,234910792,939583668,
 3758215240]