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A270080 as a simple table

na(n)
01
15
220
372
4280
51080
64216
716632
866040
9263160
101050616
114198392
1216785400
1367125240
14268468216
151073807352

[1,5,20,72,280,1080,4216,16632,66040,263160,
 1050616,4198392,16785400,67125240,268468216,
 1073807352]