A246391 - cp's OEIS frontend

A246391 On a square lattice, repeatedly write down the smallest positive number that has not yet been used, starting with the least significant digit. Write one digit per point, skipping lattice points already labeled. Move one point further regardless of content, and rotate the movement direction 90 degrees clockwise. Read the smallest number created, ignoring leading zeros and starting with the least significant digit: a(n) gives the n-th number.

n	a(n)
1	1
2	2
3	3
4	4
5	21
6	5
7	6
8	23
9	7
10	8
11	25
12	11
13	9
14	70
15	12
16	10
17	90
18	270
19	43
20	100
21	1090
22	13
23	50
24	72
25	310
26	14
27	500
28	1072
29	15
30	16
31	9013
32	20
33	17
34	7015
35	1012
36	18
37	19
38	10010
39	22
40	24
41	26
42	210
43	27
44	40
45	32
46	721
47	28
48	400
49	132
50	29
51	71
52	322
53	402
54	33
55	220
56	232

[1, 2, 3, 4, 21, 5, 6, 23, 7, 8, 25, 11, 9, 70, 12, 10, 90, 270, 43, 100, 1090, 13, 50, 72, 310, 14, 500, 1072, 15, 16, 9013, 20, 17, 7015, 1012, 18, 19, 10010, 22, 24, 26, 210, 27, 40, 32, 721, 28, 400, 132, 29, 71, 322, 402, 33, 220, 232]

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