A265207 - cp's OEIS frontend

A265207 Draw a square and follow these steps: Take a square and place at its edges isosceles right triangles with the edge as hypotenuse. Draw a square at every new edge of the triangles. Repeat for all the new squares of the same size. New figures are only placed on empty space. The structure is symmetric about the first square. The sequence gives the numbers of squares of equal size in successive rings around the center.

n	a(n)
1	1
2	8
3	20
4	36
5	60
6	92
7	140
8	204
9	300
10	428
11	620
12	876
13	1260
14	1772
15	2540
16	3564
17	5100
18	7148
19	10220
20	14316
21	20460
22	28652
23	40940
24	57324
25	81900
26	114668
27	163820
28	229356
29	327660
30	458732
31	655340
32	917484
33	1310700
34	1834988
35	2621420
36	3669996
37	5242860
38	7340012
39	10485740
40	14680044
41	20971500
42	29360108
43	41943020
44	58720236

[1, 8, 20, 36, 60, 92, 140, 204, 300, 428, 620, 876, 1260, 1772, 2540, 3564, 5100, 7148, 10220, 14316, 20460, 28652, 40940, 57324, 81900, 114668, 163820, 229356, 327660, 458732, 655340, 917484, 1310700, 1834988, 2621420, 3669996, 5242860, 7340012, 10485740, 14680044, 20971500, 29360108, 41943020, 58720236]

cp's OEIS Frontend

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