A211787 - cp's OEIS frontend

A211787 Number of (w,x,y,z) with all terms in {1,...,n} and wx<=2y*z.

n	a(n)
0	0
1	1
2	15
3	66
4	201
5	469
6	958
7	1735
8	2937
9	4656
10	7050
11	10242
12	14461
13	19813
14	26569
15	34904
16	45086
17	57293
18	71898
19	89050
20	109201
21	132534
22	159424
23	190167
24	225296
25	264966
26	309685
27	359823
28	415889
29	478142
30	547302
31	623514
32	707593
33	799821

[0, 1, 15, 66, 201, 469, 958, 1735, 2937, 4656, 7050, 10242, 14461, 19813, 26569, 34904, 45086, 57293, 71898, 89050, 109201, 132534, 159424, 190167, 225296, 264966, 309685, 359823, 415889, 478142, 547302, 623514, 707593, 799821]

cp's OEIS Frontend

A211787 Number of (w,x,y,z) with all terms in {1,...,n} and wx<=2y*z.

Table of values

List of values

cp's OEIS Frontend

A211787 Number of (w,x,y,z) with all terms in {1,...,n} and w*x<=2*y*z.

Table of values

List of values

A211787 Number of (w,x,y,z) with all terms in {1,...,n} and wx<=2y*z.