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A291526 as a simple table

na(n)
10
20
34
420
568
6196
7516
81284
93076
107172
1116388
1236868
1381924
14180228
15393220
16851972
171835012
183932164
198388612
2017825796
2137748740
2279691780
23167772164
24352321540
25738197508
261543503876
273221225476
286710886404
2913958643716
3028991029252
3160129542148

[0,0,4,20,68,196,516,1284,3076,7172,16388,36868,
 81924,180228,393220,851972,1835012,3932164,
 8388612,17825796,37748740,79691780,167772164,
 352321540,738197508,1543503876,3221225476,
 6710886404,13958643716,28991029252,60129542148]