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A236031 as a simple table

na(n)
18856
293640
3965344
411384132
5135945364
61562942580
718041076392
8210792493144
92453096266960
1028456755301120
11330738388509532
123846712748184992
1344706696393514612
14519538738634893428

[8856,93640,965344,11384132,135945364,1562942580,
 18041076392,210792493144,2453096266960,
 28456755301120,330738388509532,3846712748184992,
 44706696393514612,519538738634893428]