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A161409 as a simple table

na(n)
01
16
220
350
4105
5195
6329
7514
8754
91048
101389
111765
122159
132549
142911
153222
163461
173611
183662
193611
203461
213222
222911
232549
242159
251765
261389
271048
28754
29514
30329
31195
32105
3350
3420
356
361

[1,6,20,50,105,195,329,514,754,1048,1389,1765,
 2159,2549,2911,3222,3461,3611,3662,3611,3461,3222,
 2911,2549,2159,1765,1389,1048,754,514,329,195,105,
 50,20,6,1]