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A228986 as a simple table

na(n)
12
24
34
48
516
68
716
864
964
1016
1132
12252
13512
14252
1532
1664
17992
183928
193928
20992
2164
22128
233900
2429808
2556472
2629808
273900
28128
29256
3015328
31224720
32796568
33796568
34224720
3515328
36256
37512
3860228
391690048
4011130176
4120729216
4211130176
431690048
4460228

[2,4,4,8,16,8,16,64,64,16,32,252,512,252,32,64,
 992,3928,3928,992,64,128,3900,29808,56472,29808,
 3900,128,256,15328,224720,796568,796568,224720,
 15328,256,512,60228,1690048,11130176,20729216,
 11130176,1690048,60228]