A212515 - cp's OEIS frontend

A212515 Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y>=3z.

n	a(n)
0	0
1	0
2	0
3	8
4	28
5	63
6	150
7	280
8	468
9	780
10	1200
11	1728
12	2508
13	3458
14	4620
15	6160
16	8000
17	10125
18	12852
19	15960
20	19530
21	23870
22	28798
23	34272
24	40848
25	48100
26	56160
27	65520
28	75852
29	87075
30	100050
31	114080
32	129360
33	146608
34	165308
35	185328
36	207900
37	231990
38	257868
39	286520

[0, 0, 0, 8, 28, 63, 150, 280, 468, 780, 1200, 1728, 2508, 3458, 4620, 6160, 8000, 10125, 12852, 15960, 19530, 23870, 28798, 34272, 40848, 48100, 56160, 65520, 75852, 87075, 100050, 114080, 129360, 146608, 165308, 185328, 207900, 231990, 257868, 286520]

cp's OEIS Frontend

A212515 Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y>=3z.

Table of values

List of values