A023601 - OEIS

A023601 as a simple table

n	a(n)
1	1
2	3
3	6
4	11
5	17
6	24
7	33
8	44
9	56
10	69
11	84
12	101
13	120
14	140
15	161
16	184
17	209
18	236
19	265
20	295
21	326
22	359
23	394
24	431
25	470
26	511
27	553
28	596
29	641
30	688
31	737
32	788
33	841
34	896
35	952
36	1009
37	1068
38	1129
39	1192
40	1257
41	1324
42	1393
43	1464
44	1536
45	1609
46	1684
47	1761
48	1840
49	1921

[1,3,6,11,17,24,33,44,56,69,84,101,120,140,161, 184,209,236,265,295,326,359,394,431,470,511,553, 596,641,688,737,788,841,896,952,1009,1068,1129, 1192,1257,1324,1393,1464,1536,1609,1684,1761,1840, 1921]