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A254488 as a simple table

na(n)
1660480
221822912
3656964096
420365586688
5615887502592
618731454463744
7565727609862912
817046219218717440
9513733060035181312
1015493153946987141888
11466551500635799010048
1214062803876457224444672

[660480,21822912,656964096,20365586688,
 615887502592,18731454463744,565727609862912,
 17046219218717440,513733060035181312,
 15493153946987141888,466551500635799010048,
 14062803876457224444672]