A334711 - cp's OEIS frontend

A334711 Array read by antidiagonals: T(n,k) (n>=1, k>=1) = number of ways to select four points from an n X k grid so that they form a convex quadrilateral.

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	0
8	9
9	9
10	0
11	0
12	36
13	70
14	36
15	0
16	0
17	100
18	276
19	276
20	100
21	0
22	0
23	225
24	750
25	1038
26	750
27	225
28	0
29	0
30	441
31	1677
32	2788
33	2788
34	1677
35	441
36	0
37	0
38	784
39	3260
40	6190
41	7398
42	6190
43	3260
44	784
45	0
46	0
47	1296
48	5776
49	11942
50	16328
51	16328
52	11942
53	5776
54	1296
55	0
56	0
57	2025
58	9508
59	21062
60	31396
61	35727
62	31396
63	21062
64	9508
65	2025
66	0

[0, 0, 0, 0, 1, 0, 0, 9, 9, 0, 0, 36, 70, 36, 0, 0, 100, 276, 276, 100, 0, 0, 225, 750, 1038, 750, 225, 0, 0, 441, 1677, 2788, 2788, 1677, 441, 0, 0, 784, 3260, 6190, 7398, 6190, 3260, 784, 0, 0, 1296, 5776, 11942, 16328, 16328, 11942, 5776, 1296, 0, 0, 2025, 9508, 21062, 31396, 35727, 31396, 21062, 9508, 2025, 0]

cp's OEIS Frontend

A334711 Array read by antidiagonals: T(n,k) (n>=1, k>=1) = number of ways to select four points from an n X k grid so that they form a convex quadrilateral.

Table of values

List of values