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A071817 as a simple table

na(n)
11
23
36
410
515
621
728
836
945
1054
1161
1266
1369
1470
1569
1666
1761
1854
1945
2036
2128
2221
2315
2410
256
263
271

[1,3,6,10,15,21,28,36,45,54,61,66,69,70,69,66,61,
 54,45,36,28,21,15,10,6,3,1]