A212560 - cp's OEIS frontend

A212560 Number of (w,x,y,z) with all terms in {1,...,n} and w+x<=y+z.

n	a(n)
0	0
1	1
2	11
3	50
4	150
5	355
6	721
7	1316
8	2220
9	3525
10	5335
11	7766
12	10946
13	15015
14	20125
15	26440
16	34136
17	43401
18	54435
19	67450
20	82670
21	100331
22	120681
23	143980
24	170500
25	200525
26	234351
27	272286
28	314650
29	361775
30	414005
31	471696
32	535216
33	604945
34	681275

[0, 1, 11, 50, 150, 355, 721, 1316, 2220, 3525, 5335, 7766, 10946, 15015, 20125, 26440, 34136, 43401, 54435, 67450, 82670, 100331, 120681, 143980, 170500, 200525, 234351, 272286, 314650, 361775, 414005, 471696, 535216, 604945, 681275]

cp's OEIS Frontend

A212560 Number of (w,x,y,z) with all terms in {1,...,n} and w+x<=y+z.

Table of values

List of values