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A057220 as a simple table

na(n)
12
24
36
48
512
614
718
836
968
10152
11212
12324
131434
141592
151668
163338
177908
189662
1927968
2028116
2133974
2241774
2366804
24144518
25162954
26241032
27366218
28676592
29991968

[2,4,6,8,12,14,18,36,68,152,212,324,1434,1592,
 1668,3338,7908,9662,27968,28116,33974,41774,66804,
 144518,162954,241032,366218,676592,991968]