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A237340 as a simple table

na(n)
1256
21980
31980
415082
541220
615082
7120808
8821234
9821234
10120808
11972356
1217627820
1339609294
1417627820
15972356
167935194
17380945760
182137181038
192137181038
20380945760
217935194
2265088736
238406402902
24114598315886

[256,1980,1980,15082,41220,15082,120808,821234,
 821234,120808,972356,17627820,39609294,17627820,
 972356,7935194,380945760,2137181038,2137181038,
 380945760,7935194,65088736,8406402902,
 114598315886]