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A280118 as a simple table

na(n)
10
24
38
428
580
6252
7776
82356
97200
1021836
1166104
12199652
13601424
141808252
155426024
1616253460
1748608384
18145152940
19432853144
201289129028
213834701744
2211394112476
2333820033480
24100286009972
25297101633248
26879410116620
272600884035320

[0,4,8,28,80,252,776,2356,7200,21836,66104,199652,
 601424,1808252,5426024,16253460,48608384,
 145152940,432853144,1289129028,3834701744,
 11394112476,33820033480,100286009972,297101633248,
 879410116620,2600884035320]