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A281972 as a simple table

na(n)
01
13
28
326
469
5166
6365
7750
81446
92646
104645
117856
1212852
1320411
1431626
1547910
1671022
17103342
18147982
19208554
20289572
21397140
22538319
23720965
24955716
251255661
261634233
272108003
282699453
293431884
304329465
315426928
326764353
338377805
3410314695
3512640228

[1,3,8,26,69,166,365,750,1446,2646,4645,7856,
 12852,20411,31626,47910,71022,103342,147982,
 208554,289572,397140,538319,720965,955716,1255661,
 1634233,2108003,2699453,3431884,4329465,5426928,
 6764353,8377805,10314695,12640228]