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A145618 as a simple table

na(n)
12
212
312
4168
5504
65544
772072
8144144
92450448
1046558512
114232592
1297349616
1397349616
1441721264
151209916656
1675014832672
17825163159392
185776142115744
19213717258282528
20213717258282528
211251772512797664
2253826218050299552

[2,12,12,168,504,5544,72072,144144,2450448,
 46558512,4232592,97349616,97349616,41721264,
 1209916656,75014832672,825163159392,5776142115744,
 213717258282528,213717258282528,1251772512797664,
 53826218050299552]