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A270169 as a simple table

na(n)
01
15
220
368
4268
51020
64236
717020
867220
9269180
101076084
114298556
1217141436
1368333836
14272489556
151087119500

[1,5,20,68,268,1020,4236,17020,67220,269180,
 1076084,4298556,17141436,68333836,272489556,
 1087119500]