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A009972 as a simple table

na(n)
01
128
2784
321952
4614656
517210368
6481890304
713492928512
8377801998336
910578455953408
10296196766695424
118293509467471872
12232218265089212416
136502111422497947648
14182059119829942534144
155097655355238390956032

[1,28,784,21952,614656,17210368,481890304,
 13492928512,377801998336,10578455953408,
 296196766695424,8293509467471872,
 232218265089212416,6502111422497947648,
 182059119829942534144,5097655355238390956032]