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A121304 as a simple table

na(n)
21
31
42
55
65
714
817
932
1053
1176
12139
13198
14334
15515
16798
171280
181938
193075
204710
217299
2211298
2317296
2426738
2540874
2662763
2796036
28146674
29224210
30341562
31520767
32792375
331204951
341831124
352779234
364217008
376391663
389683056
3914659038
4022177341

[1,1,2,5,5,14,17,32,53,76,139,198,334,515,798,
 1280,1938,3075,4710,7299,11298,17296,26738,40874,
 62763,96036,146674,224210,341562,520767,792375,
 1204951,1831124,2779234,4217008,6391663,9683056,
 14659038,22177341]