A212679 - cp's OEIS frontend

A212679 Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=|y-z|.

n	a(n)
0	0
1	1
2	8
3	33
4	80
5	165
6	288
7	469
8	704
9	1017
10	1400
11	1881
12	2448
13	3133
14	3920
15	4845
16	5888
17	7089
18	8424
19	9937
20	11600
21	13461
22	15488
23	17733
24	20160
25	22825
26	25688
27	28809
28	32144
29	35757
30	39600
31	43741
32	48128
33	52833
34	57800
35	63105
36	68688
37	74629
38	80864

[0, 1, 8, 33, 80, 165, 288, 469, 704, 1017, 1400, 1881, 2448, 3133, 3920, 4845, 5888, 7089, 8424, 9937, 11600, 13461, 15488, 17733, 20160, 22825, 25688, 28809, 32144, 35757, 39600, 43741, 48128, 52833, 57800, 63105, 68688, 74629, 80864]

cp's OEIS Frontend

A212679 Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=|y-z|.

Table of values

List of values