A181106 - OEIS

A181106 as a simple table

n	a(n)
1	-1
2	3
3	7
4	15
5	23
6	35
7	47
8	63
9	79
10	99
11	119
12	143
13	167
14	195
15	223
16	255
17	287
18	323
19	359
20	399
21	439
22	483
23	527
24	575
25	623
26	675
27	727
28	783
29	839
30	899
31	959
32	1023
33	1087
34	1155
35	1223
36	1295
37	1367
38	1443
39	1519
40	1599
41	1679
42	1763
43	1847
44	1935
45	2023
46	2115
47	2207
48	2303
49	2399
50	2499

[-1,3,7,15,23,35,47,63,79,99,119,143,167,195,223, 255,287,323,359,399,439,483,527,575,623,675,727, 783,839,899,959,1023,1087,1155,1223,1295,1367, 1443,1519,1599,1679,1763,1847,1935,2023,2115,2207, 2303,2399,2499]