A212575 - cp's OEIS frontend

A212575 Number of (w,x,y,z) with all terms in {1,...,n} and 2|w-x|=|x-y|+|y-z|.

n	a(n)
0	0
1	1
2	4
3	17
4	42
5	85
6	142
7	235
8	346
9	495
10	680
11	911
12	1172
13	1505
14	1872
15	2305
16	2798
17	3365
18	3978
19	4699
20	5470
21	6335
22	7284
23	8335
24	9448
25	10705
26	12028
27	13473
28	15026
29	16709
30	18470
31	20411
32	22434
33	24607
34	26912
35	29375
36	31932
37	34705
38	37576
39	40625
40	43830

[0, 1, 4, 17, 42, 85, 142, 235, 346, 495, 680, 911, 1172, 1505, 1872, 2305, 2798, 3365, 3978, 4699, 5470, 6335, 7284, 8335, 9448, 10705, 12028, 13473, 15026, 16709, 18470, 20411, 22434, 24607, 26912, 29375, 31932, 34705, 37576, 40625, 43830]

cp's OEIS Frontend

A212575 Number of (w,x,y,z) with all terms in {1,...,n} and 2|w-x|=|x-y|+|y-z|.

Table of values

List of values