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A155120 as a simple table

na(n)
0-2
14
226
376
4166
5308
6514
7796
81166
91636
102218
112924
123766
134756
145906
157228
168734
1710436
1812346
1914476
2016838
2119444
2222306
2325436
2428846
2532548
2636554
2740876
2845526
2950516
3055858

[-2,4,26,76,166,308,514,796,1166,1636,2218,2924,
 3766,4756,5906,7228,8734,10436,12346,14476,16838,
 19444,22306,25436,28846,32548,36554,40876,45526,
 50516,55858]