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A309128 as a simple table

na(n)
11
21
34
44
512
620
740
870
9150
10284
11564
121116
132212
144392
158768
1617404
1734704
1869214
19137980
20275264
21549340
221096244
232188344
244369196
258724196
2617422500
2734797476
2869505628
29138845940
30277383904
31554189344
321107296248
332212559996
344421289872
358835361488

[1,1,4,4,12,20,40,70,150,284,564,1116,2212,4392,
 8768,17404,34704,69214,137980,275264,549340,
 1096244,2188344,4369196,8724196,17422500,34797476,
 69505628,138845940,277383904,554189344,1107296248,
 2212559996,4421289872,8835361488]