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A250983 as a simple table

na(n)
11
22
32
44
54
66
76
86
96
1010
1110
1210
1310
1414
1514
1614
1714
1814
1914
2020
2120
2220
2320
2420
2520
2626
2726
2826
2926
3026
3126
3232
3332
3432
3532
3632
3732
3838
3938
4038
4138
4238
4338
4438
4538
4638
4738
4848
4948
5048
5148
5248
5348
5448
5548
5648
5748
5858
5958
6058
6158
6258
6358
6458
6558
6658
6758

[1,2,2,4,4,6,6,6,6,10,10,10,10,14,14,14,14,14,14,
 20,20,20,20,20,20,26,26,26,26,26,26,32,32,32,32,
 32,32,38,38,38,38,38,38,38,38,38,38,48,48,48,48,
 48,48,48,48,48,48,58,58,58,58,58,58,58,58,58,58]