A212109 - cp's OEIS frontend

A212109 Number of (w,x,y,z) with all terms in {1,...,n} and wx-yz<=n.

n	a(n)
0	0
1	1
2	15
3	69
4	203
5	467
6	935
7	1661
8	2770
9	4326
10	6476
11	9280
12	13025
13	17635
14	23475
15	30614
16	39319
17	49557
18	61969
19	76227
20	93166
21	112525
22	134801
23	159969
24	189233
25	221589
26	258185
27	299022
28	344875
29	395057
30	451641
31	512851
32	580999
33	655166
34	736374

[0, 1, 15, 69, 203, 467, 935, 1661, 2770, 4326, 6476, 9280, 13025, 17635, 23475, 30614, 39319, 49557, 61969, 76227, 93166, 112525, 134801, 159969, 189233, 221589, 258185, 299022, 344875, 395057, 451641, 512851, 580999, 655166, 736374]

cp's OEIS Frontend

A212109 Number of (w,x,y,z) with all terms in {1,...,n} and wx-yz<=n.

Table of values

List of values

cp's OEIS Frontend

A212109 Number of (w,x,y,z) with all terms in {1,...,n} and w*x-y*z<=n.

Table of values

List of values

A212109 Number of (w,x,y,z) with all terms in {1,...,n} and wx-yz<=n.