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A237694 as a simple table

na(n)
1256
21120
31120
45038
56964
65038
723838
844648
944648
1023838
11115028
12305054
13408824
14305054
15115028
16567446
172123660
184021892
194021892
202123660
21567446
222840760
2315253914
2440288632
2557342898
2640288632
2715253914
282840760
2914437142

[256,1120,1120,5038,6964,5038,23838,44648,44648,
 23838,115028,305054,408824,305054,115028,567446,
 2123660,4021892,4021892,2123660,567446,2840760,
 15253914,40288632,57342898,40288632,15253914,
 2840760,14437142]