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A112489 as a simple table

na(n)
315
4315
54900
670532
71008980
814777620
9224655816
103568061640
1159371808496
121035987707664
1318953413075584
14363290743698048
157287692926408704
16152811506045431296
173344880701417587200
1876327884878442508800

[15,315,4900,70532,1008980,14777620,224655816,
 3568061640,59371808496,1035987707664,
 18953413075584,363290743698048,7287692926408704,
 152811506045431296,3344880701417587200,
 76327884878442508800]