A181947 - cp's OEIS frontend

A181947 Number of rhombi, distinct up to congruence, on an n X n grid (or geoboard).

n	a(n)
1	0
2	1
3	3
4	6
5	11
6	16
7	24
8	31
9	43
10	53
11	67
12	78
13	99
14	112
15	132
16	151
17	179
18	196
19	226
20	245
21	282
22	309
23	341
24	364
25	416
26	445
27	483
28	517
29	570
30	599
31	659
32	690
33	754
34	797
35	847
36	894
37	975
38	1012
39	1068
40	1119
41	1211
42	1252
43	1338
44	1381
45	1466
46	1536
47	1604
48	1651
49	1775
50	1833
51	1923
52	1990
53	2091

[0, 1, 3, 6, 11, 16, 24, 31, 43, 53, 67, 78, 99, 112, 132, 151, 179, 196, 226, 245, 282, 309, 341, 364, 416, 445, 483, 517, 570, 599, 659, 690, 754, 797, 847, 894, 975, 1012, 1068, 1119, 1211, 1252, 1338, 1381, 1466, 1536, 1604, 1651, 1775, 1833, 1923, 1990, 2091]

cp's OEIS Frontend

A181947 Number of rhombi, distinct up to congruence, on an n X n grid (or geoboard).

Table of values

List of values