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A128104 as a simple table

na(n)
12
26
318
452
5145
6402
71092
82976
98100
1022020
1159873
12162744
13442403
141202600
153269010
168886096
1724154943
1865659968
19178482295
20485165180
211318815729
223584912826
239744803438
2426489122128
2572004899325
26195729609426

[2,6,18,52,145,402,1092,2976,8100,22020,59873,
 162744,442403,1202600,3269010,8886096,24154943,
 65659968,178482295,485165180,1318815729,
 3584912826,9744803438,26489122128,72004899325,
 195729609426]