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A143608 as a simple table

na(n)
00
11
24
37
424
541
6140
7239
8816
91393
104756
118119
1227720
1347321
14161564
15275807
16941664
171607521
185488420
199369319
2031988856
2154608393
22186444716
23318281039
241086679440
251855077841
266333631924
2710812186007
2836915112104
2963018038201
30215157040700

[0,1,4,7,24,41,140,239,816,1393,4756,8119,27720,
 47321,161564,275807,941664,1607521,5488420,
 9369319,31988856,54608393,186444716,318281039,
 1086679440,1855077841,6333631924,10812186007,
 36915112104,63018038201,215157040700]