A271911 - cp's OEIS frontend

A271911 Number of ways to choose three distinct points from a 2 X n grid so that they form an isosceles triangle.

n	a(n)
1	0
2	4
3	10
4	16
5	24
6	32
7	42
8	52
9	64
10	76
11	90
12	104
13	120
14	136
15	154
16	172
17	192
18	212
19	234
20	256
21	280
22	304
23	330
24	356
25	384
26	412
27	442
28	472
29	504
30	536
31	570
32	604
33	640
34	676
35	714
36	752
37	792
38	832
39	874
40	916
41	960
42	1004
43	1050
44	1096
45	1144
46	1192
47	1242
48	1292
49	1344
50	1396
51	1450
52	1504

[0, 4, 10, 16, 24, 32, 42, 52, 64, 76, 90, 104, 120, 136, 154, 172, 192, 212, 234, 256, 280, 304, 330, 356, 384, 412, 442, 472, 504, 536, 570, 604, 640, 676, 714, 752, 792, 832, 874, 916, 960, 1004, 1050, 1096, 1144, 1192, 1242, 1292, 1344, 1396, 1450, 1504]

cp's OEIS Frontend

A271911 Number of ways to choose three distinct points from a 2 X n grid so that they form an isosceles triangle.

Table of values

List of values