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A284125 as a simple table

na(n)
10
20
32
44
512
626
752
898
9178
10316
11556
12972
131694
142950
155140
168968
1715676
1827460
1948212
2084844
21149656
22264578
23468780
24832344
251480860
262639730
274714066
288432938
2915110070
3027115448
3148729252
3287689374
33157998112
34285016412
35514716578
36930499110
371683776276

[0,0,2,4,12,26,52,98,178,316,556,972,1694,2950,
 5140,8968,15676,27460,48212,84844,149656,264578,
 468780,832344,1480860,2639730,4714066,8432938,
 15110070,27115448,48729252,87689374,157998112,
 285016412,514716578,930499110,1683776276]