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A228735 as a simple table

na(n)
14
216
364
4232
5696
62072
76130
818378
955716
10169734
11517764
121578184
134806344
1414629384
1544519552
16135480532
17412314438
181254882280
193819338704
2011624541548
2135380360780
22107682931160
23327740673246
24997501106370
253035962621026

[4,16,64,232,696,2072,6130,18378,55716,169734,
 517764,1578184,4806344,14629384,44519552,
 135480532,412314438,1254882280,3819338704,
 11624541548,35380360780,107682931160,327740673246,
 997501106370,3035962621026]