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A011779 as a simple table

na(n)
01
13
26
312
421
533
651
775
8105
9145
10195
11255
12330
13420
14525
15651
16798
17966
181162
191386
201638
211926
222250
232610
243015
253465
263960
274510
285115
295775
306501
317293
328151
339087
3410101
3511193
3612376
3713650

[1,3,6,12,21,33,51,75,105,145,195,255,330,420,525,
 651,798,966,1162,1386,1638,1926,2250,2610,3015,
 3465,3960,4510,5115,5775,6501,7293,8151,9087,
 10101,11193,12376,13650]