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A240828 as a simple table

na(n)
10
20
32
42
54
62
76
84
98
104
1110
126
1312
146
1514
168
1716
188
1918
2010
2120
2210
2322
2412
2524
2612
2726
2814
2928
3014
3130
3216
3332
3416
3534
3618
3736
3818
3938
4020
4140
4220
4342
4422
4544
4622
4746
4824
4948
5024
5150
5226
5352
5426
5554
5628
5756
5828
5958
6030
6160
6230
6362
6432
6564
6632
6766
6834
6968
7034
7170
7236
7372
7436
7574
7638
7776
7838
7978
8040
8180
8240

[0,0,2,2,4,2,6,4,8,4,10,6,12,6,14,8,16,8,18,10,20,
 10,22,12,24,12,26,14,28,14,30,16,32,16,34,18,36,
 18,38,20,40,20,42,22,44,22,46,24,48,24,50,26,52,
 26,54,28,56,28,58,30,60,30,62,32,64,32,66,34,68,
 34,70,36,72,36,74,38,76,38,78,40,80,40]