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A353699 as a simple table

na(n)
12
26
320
436
556
6176
7240
8416
9864
101088
111344
122432
133200
145888
158448
1614848
1723040
1831744
1935840
2039936
2175776
22167936
23208896
24331776
25352256
26450560
27516096
28770048
29802816
30933888
311736704
322457600
333866624
344259840
354521984
367995392
3712976128
3817563648

[2,6,20,36,56,176,240,416,864,1088,1344,2432,3200,
 5888,8448,14848,23040,31744,35840,39936,75776,
 167936,208896,331776,352256,450560,516096,770048,
 802816,933888,1736704,2457600,3866624,4259840,
 4521984,7995392,12976128,17563648]