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A118921 as a simple table

na(n)
12
24
32
412
54
64
740
812
98
1010
11140
1240
1324
1420
1528
16504
17140
1880
1960
2056
2184
221848
23504
24280
25200
26168
27168
28264
296864
301848
311008
32700
33560
34504
35528
36858
3725740
386864
393696
402520
411960
421680
431584
441716
452860
4697240
4725740
4813728
499240
507056
515880
525280

[2,4,2,12,4,4,40,12,8,10,140,40,24,20,28,504,140,
 80,60,56,84,1848,504,280,200,168,168,264,6864,
 1848,1008,700,560,504,528,858,25740,6864,3696,
 2520,1960,1680,1584,1716,2860,97240,25740,13728,
 9240,7056,5880,5280]