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A247742 as a simple table

na(n)
00
10
20
320
4192
51568
612636
7114216
81022604
98640980
1072406668
11605996308
125065065936
1342045917448
14346705312932
152848191025876
1623325323646860
17190440300054560
181550193295412264
1912585187313440032
20101937894879304356
21823951520087842720
226646993031822674592

[0,0,0,20,192,1568,12636,114216,1022604,8640980,
 72406668,605996308,5065065936,42045917448,
 346705312932,2848191025876,23325323646860,
 190440300054560,1550193295412264,
 12585187313440032,101937894879304356,
 823951520087842720,6646993031822674592]