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A261636 as a simple table

na(n)
01
14
210
320
435
560
6100
7160
8245
9364
10536
11780
121115
131564
142166
152980
164065
175484
187326
199720
2012830
2116824
2221902
2328344
2436510
2546820
2659736
2775844
2895910
29120844
30151688
31189668
32236330
33293564
34363542
35448804
36552425
37678144
38830338
391014052
401235296

[1,4,10,20,35,60,100,160,245,364,536,780,1115,
 1564,2166,2980,4065,5484,7326,9720,12830,16824,
 21902,28344,36510,46820,59736,75844,95910,120844,
 151688,189668,236330,293564,363542,448804,552425,
 678144,830338,1014052,1235296]