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A274520 as a simple table

na(n)
00
12
24
320
464
5248
6880
73248
811776
943040
10156736
11571712
122083840
137597952
1427698944
15100985600
16368164864
171342243328
184893475840
1917840411648
2065041678336
21237125826560
22864501723136
233151758405632
2411490527150080
2541891604733952
26152726372368384

[0,2,4,20,64,248,880,3248,11776,43040,156736,
 571712,2083840,7597952,27698944,100985600,
 368164864,1342243328,4893475840,17840411648,
 65041678336,237125826560,864501723136,
 3151758405632,11490527150080,41891604733952,
 152726372368384]