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A268418 as a simple table

na(n)
112192180
215724800
324384360
431449600
536576540
647174400
748768720
860960900
962899200
1073153080
1178624000
1285345260
1394348800
1497537440
15109729620
16110073600
17121921800
18125798400
19134113980
20141523200
21146306160
22157248000
23158498340
24170690520
25182882700
26188697600
27195074880

[12192180,15724800,24384360,31449600,36576540,
 47174400,48768720,60960900,62899200,73153080,
 78624000,85345260,94348800,97537440,109729620,
 110073600,121921800,125798400,134113980,141523200,
 146306160,157248000,158498340,170690520,182882700,
 188697600,195074880]