A239731 - OEIS

A239731 as a simple table

n	a(n)
1	-1
2	0
3	-1
4	0
5	-3
6	0
7	-1
8	10
9	17
10	20
11	33
12	40
13	59
14	90
15	117
16	140
17	163
18	218
19	237
20	286
21	345
22	390
23	443
24	502
25	551
26	614
27	701
28	784
29	881
30	976
31	1011
32	1112
33	1215
34	1330
35	1417
36	1550
37	1665
38	1780
39	1923
40	2056
41	2203
42	2360
43	2485
44	2660
45	2827
46	3010
47	3141
48	3252
49	3455
50	3670
51	3879
52	4090
53	4307
54	4484
55	4717
56	4932
57	5147
58	5400
59	5631
60	5876
61	6135
62	6362
63	6555
64	6830
65	7125
66	7424
67	7633
68	7922

[-1,0,-1,0,-3,0,-1,10,17,20,33,40,59,90,117,140, 163,218,237,286,345,390,443,502,551,614,701,784, 881,976,1011,1112,1215,1330,1417,1550,1665,1780, 1923,2056,2203,2360,2485,2660,2827,3010,3141,3252, 3455,3670,3879,4090,4307,4484,4717,4932,5147,5400, 5631,5876,6135,6362,6555,6830,7125,7424,7633,7922]