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A263993 as a simple table

na(n)
01
12
24
310
420
536
664
7112
8189
9308
10492
11778
121210
131844
142776
154144
166114
178914
1812884
1918484
2026302
2137124
2252040
2372512
24100415
25138196
26189160
27257648
28349184
29470932
30632312
31845472
321125853
331493222
341973060
352597892
363408754
374457600
385810544

[1,2,4,10,20,36,64,112,189,308,492,778,1210,1844,
 2776,4144,6114,8914,12884,18484,26302,37124,52040,
 72512,100415,138196,189160,257648,349184,470932,
 632312,845472,1125853,1493222,1973060,2597892,
 3408754,4457600,5810544]