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A065143 as a simple table

na(n)
01
10
24
312
444
5220
61228
77196
845004
9303900
102201676
1116920860
12136966860
131163989788
1410364408140
1596463232284
16935872773068
179440653262620
1898809201693260
191071131795708188
2012007932126074060

[1,0,4,12,44,220,1228,7196,45004,303900,2201676,
 16920860,136966860,1163989788,10364408140,
 96463232284,935872773068,9440653262620,
 98809201693260,1071131795708188,12007932126074060]