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A101310 as a simple table

na(n)
00
120
2320
35320
475320
51175320
614175320
7184175320
82084175320
925084175320
10315084175320
113415084175320
1240415084175320
13450415084175320
144750415084175320
1551750415084175320
16581750415084175320

[0,20,320,5320,75320,1175320,14175320,184175320,
 2084175320,25084175320,315084175320,3415084175320,
 40415084175320,450415084175320,4750415084175320,
 51750415084175320,581750415084175320]