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A237488 as a simple table

na(n)
1256
21464
31464
48770
515898
68770
755318
8180730
9180730
1055318
11357516
122218016
133903294
142218016
15357516
162371070
1727849668
1892508252
1992508252
2027849668
212371070
2215989568
23361041844
242218452183
254269381134
262218452183
27361041844

[256,1464,1464,8770,15898,8770,55318,180730,
 180730,55318,357516,2218016,3903294,2218016,
 357516,2371070,27849668,92508252,92508252,
 27849668,2371070,15989568,361041844,2218452183,
 4269381134,2218452183,361041844]