A143823 - cp's OEIS frontend

A143823 Number of subsets {x(1),x(2),...,x(k)} of {1,2,...,n} such that all differences |x(i)-x(j)| are distinct.

n	a(n)
0	1
1	2
2	4
3	7
4	13
5	22
6	36
7	57
8	91
9	140
10	216
11	317
12	463
13	668
14	962
15	1359
16	1919
17	2666
18	3694
19	5035
20	6845
21	9188
22	12366
23	16417
24	21787
25	28708
26	37722
27	49083
28	63921
29	82640
30	106722
31	136675
32	174895
33	222558
34	283108
35	357727
36	451575
37	567536
38	712856
39	890405
40	1112081
41	1382416
42	1717540

[1, 2, 4, 7, 13, 22, 36, 57, 91, 140, 216, 317, 463, 668, 962, 1359, 1919, 2666, 3694, 5035, 6845, 9188, 12366, 16417, 21787, 28708, 37722, 49083, 63921, 82640, 106722, 136675, 174895, 222558, 283108, 357727, 451575, 567536, 712856, 890405, 1112081, 1382416, 1717540]

cp's OEIS Frontend

A143823 Number of subsets {x(1),x(2),...,x(k)} of {1,2,...,n} such that all differences |x(i)-x(j)| are distinct.

Table of values

List of values