A212520 - cp's OEIS frontend

A212520 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	4
3	16
4	56
5	132
6	279
7	504
8	880
9	1380
10	2125
11	3090
12	4392
13	6006
14	8134
15	10640
16	13824
17	17568
18	22113
19	27360
20	33700
21	40810
22	49247
23	58740
24	69696
25	81900
26	95992
27	111384
28	128968
29	148260
30	169875
31	193440
32	219904
33	248336
34	280041
35	314262
36	351864
37	392274
38	436810

[0, 0, 4, 16, 56, 132, 279, 504, 880, 1380, 2125, 3090, 4392, 6006, 8134, 10640, 13824, 17568, 22113, 27360, 33700, 40810, 49247, 58740, 69696, 81900, 95992, 111384, 128968, 148260, 169875, 193440, 219904, 248336, 280041, 314262, 351864, 392274, 436810]

cp's OEIS Frontend

A212520 Number of (w,x,y,z) with all terms in {1,...,n} and w>=2x and y<3z.

Table of values

List of values