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A089668 as a simple table

na(n)
00
14
2521
317136
4320716
54356560
648024786
7456843520
83893995184
930487086144
10223052123830
111544098243424
1210208488021176
1364917814932256
14399310478637476
152386386863086080
1613906802738650816
1779261768839946496
18442921922267640894

[0,4,521,17136,320716,4356560,48024786,456843520,
 3893995184,30487086144,223052123830,1544098243424,
 10208488021176,64917814932256,399310478637476,
 2386386863086080,13906802738650816,
 79261768839946496,442921922267640894]