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A107731 as a simple table

na(n)
01
121
2141
3521
41401
53101
66021
710641
817521
927301
1040701
1158521
1281641
13111021
14147701
15192801
16247521
17313141
18391021
19482601
20589401
21713021
22855141
231017521
241202001
251410501
261645021
271907641
282200521
292525901
302886101
313283521

[1,21,141,521,1401,3101,6021,10641,17521,27301,
 40701,58521,81641,111021,147701,192801,247521,
 313141,391021,482601,589401,713021,855141,1017521,
 1202001,1410501,1645021,1907641,2200521,2525901,
 2886101,3283521]