A211809 - cp's OEIS frontend

A211809 Number of 4-tuples (w,x,y,z) with all terms in {1,...,n} and wx >= 2y*z.

n	a(n)
0	0
1	0
2	5
3	23
4	79
5	188
6	402
7	742
8	1283
9	2059
10	3164
11	4633
12	6615
13	9112
14	12299
15	16253
16	21114
17	26924
18	33932
19	42161
20	51885
21	63153
22	76182
23	91068
24	108172
25	127453
26	149257
27	173726
28	201163
29	231591
30	265520
31	302889
32	344195
33	389508
34	439180
35	493458

[0, 0, 5, 23, 79, 188, 402, 742, 1283, 2059, 3164, 4633, 6615, 9112, 12299, 16253, 21114, 26924, 33932, 42161, 51885, 63153, 76182, 91068, 108172, 127453, 149257, 173726, 201163, 231591, 265520, 302889, 344195, 389508, 439180, 493458]

cp's OEIS Frontend

A211809 Number of 4-tuples (w,x,y,z) with all terms in {1,...,n} and wx >= 2y*z.

Table of values

List of values

cp's OEIS Frontend

A211809 Number of 4-tuples (w,x,y,z) with all terms in {1,...,n} and w*x >= 2*y*z.

Table of values

List of values

A211809 Number of 4-tuples (w,x,y,z) with all terms in {1,...,n} and wx >= 2y*z.