A272459 - cp's OEIS frontend

A272459 The total number of different isosceles trapezoids, excluding squares, that can be drawn on an n X n square grid where the corners of each individual trapezoid lie on a lattice point.

n	a(n)
1	0
2	1
3	7
4	18
5	40
6	71
7	119
8	180
9	264
10	365
11	495
12	646
13	832
14	1043
15	1295
16	1576
17	1904
18	2265
19	2679
20	3130
21	3640
22	4191
23	4807
24	5468
25	6200
26	6981
27	7839
28	8750
29	9744
30	10795
31	11935
32	13136
33	14432
34	15793
35	17255
36	18786
37	20424
38	22135
39	23959
40	25860
41	27880
42	29981
43	32207
44	34518

[0, 1, 7, 18, 40, 71, 119, 180, 264, 365, 495, 646, 832, 1043, 1295, 1576, 1904, 2265, 2679, 3130, 3640, 4191, 4807, 5468, 6200, 6981, 7839, 8750, 9744, 10795, 11935, 13136, 14432, 15793, 17255, 18786, 20424, 22135, 23959, 25860, 27880, 29981, 32207, 34518]

cp's OEIS Frontend

A272459 The total number of different isosceles trapezoids, excluding squares, that can be drawn on an n X n square grid where the corners of each individual trapezoid lie on a lattice point.

Table of values

List of values