A212680 - cp's OEIS frontend

A212680 Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=|y-z|+1.

n	a(n)
0	0
1	0
2	4
3	18
4	56
5	120
6	228
7	378
8	592
9	864
10	1220
11	1650
12	2184
13	2808
14	3556
15	4410
16	5408
17	6528
18	7812
19	9234
20	10840
21	12600
22	14564
23	16698
24	19056
25	21600
26	24388
27	27378
28	30632
29	34104
30	37860
31	41850
32	46144
33	50688
34	55556
35	60690
36	66168
37	71928
38	78052

[0, 0, 4, 18, 56, 120, 228, 378, 592, 864, 1220, 1650, 2184, 2808, 3556, 4410, 5408, 6528, 7812, 9234, 10840, 12600, 14564, 16698, 19056, 21600, 24388, 27378, 30632, 34104, 37860, 41850, 46144, 50688, 55556, 60690, 66168, 71928, 78052]

cp's OEIS Frontend

A212680 Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=|y-z|+1.

Table of values

List of values