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A268972 as a simple table

na(n)
19
260
3240
4912
53312
611664
740176
8136080
9454896
101504656
114933872
1216061328
1351963120
14167226768
15535692528
161709114256
175433452784
1817218688400
1954411055344
20171498136464
21539289320688
221692252695952
235299912289520

[9,60,240,912,3312,11664,40176,136080,454896,
 1504656,4933872,16061328,51963120,167226768,
 535692528,1709114256,5433452784,17218688400,
 54411055344,171498136464,539289320688,
 1692252695952,5299912289520]