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A278680 as a simple table

na(n)
01
14
214
340
4105
5251
6570
71226
82540
95075
109855
1118630
1234439
1362340
14110805
15193624
16333235
17565415
18947040
191567130
202564425
214152535
226658711
2310579380
2416663755
2526033200
2640357641
2762106290
2894912385
29144088840
30217368655
31325945320
32485950150
33720515475

[1,4,14,40,105,251,570,1226,2540,5075,9855,18630,
 34439,62340,110805,193624,333235,565415,947040,
 1567130,2564425,4152535,6658711,10579380,16663755,
 26033200,40357641,62106290,94912385,144088840,
 217368655,325945320,485950150,720515475]