A339623 - cp's OEIS frontend

A339623 Consider a square drawn on the perimeter of a square lattice with side length n. a(n) is the number of regions inside the square after drawing unit circles centered at each interior lattice point of the square.

n	a(n)
1	1
2	5
3	21
4	52
5	97
6	156
7	229
8	316
9	417
10	532
11	661
12	804
13	961
14	1132
15	1317
16	1516
17	1729
18	1956
19	2197
20	2452
21	2721
22	3004
23	3301
24	3612
25	3937
26	4276
27	4629
28	4996
29	5377
30	5772
31	6181
32	6604
33	7041
34	7492
35	7957
36	8436
37	8929
38	9436
39	9957
40	10492
41	11041
42	11604
43	12181
44	12772
45	13377
46	13996
47	14629
48	15276
49	15937
50	16612
51	17301

[1, 5, 21, 52, 97, 156, 229, 316, 417, 532, 661, 804, 961, 1132, 1317, 1516, 1729, 1956, 2197, 2452, 2721, 3004, 3301, 3612, 3937, 4276, 4629, 4996, 5377, 5772, 6181, 6604, 7041, 7492, 7957, 8436, 8929, 9436, 9957, 10492, 11041, 11604, 12181, 12772, 13377, 13996, 14629, 15276, 15937, 16612, 17301]

cp's OEIS Frontend

A339623 Consider a square drawn on the perimeter of a square lattice with side length n. a(n) is the number of regions inside the square after drawing unit circles centered at each interior lattice point of the square.

Table of values

List of values