A334741 - cp's OEIS frontend

A334741 Fill an infinite square array by following a spiral around the origin; in the central cell enter a(0)=1; thereafter, in the n-th cell, enter the sum of the entries of those earlier cells that are in the same row or column as that cell.

n	a(n)
0	1
1	1
2	1
3	2
4	3
5	5
6	8
7	11
8	21
9	40
10	47
11	93
12	180
13	203
14	397
15	796
16	1576
17	1675
18	3305
19	6636
20	13192
21	14004
22	27607
23	55029
24	110192
25	220024
26	226740
27	450123
28	898661
29	1798700
30	3594248
31	3704800
32	7354303
33	14681369
34	29349536
35	58710640
36	117394896
37	119196748
38	237492079

[1, 1, 1, 2, 3, 5, 8, 11, 21, 40, 47, 93, 180, 203, 397, 796, 1576, 1675, 3305, 6636, 13192, 14004, 27607, 55029, 110192, 220024, 226740, 450123, 898661, 1798700, 3594248, 3704800, 7354303, 14681369, 29349536, 58710640, 117394896, 119196748, 237492079]

cp's OEIS Frontend

A334741 Fill an infinite square array by following a spiral around the origin; in the central cell enter a(0)=1; thereafter, in the n-th cell, enter the sum of the entries of those earlier cells that are in the same row or column as that cell.

Table of values

List of values