cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A293670 Square array made of (W, N, S, E) quadruplets read by antidiagonals. Numeric structure of an anamorphosis of A002024 (see comments).

Table of values

n a(n)
1 1
2 -1
3 0
4 2
5 1
6 0
7 2
8 -1
9 1
10 2
11 0
12 3
13 1
14 1
15 2
16 0
17 3
18 -1
19 2
20 2
21 1
22 3
23 0
24 4
25 1
26 2
27 2
28 1
29 3
30 0
31 4
32 -1
33 3
34 2
35 2
36 3
37 1
38 4
39 0
40 5
41 1
42 3
43 2
44 2
45 3
46 1
47 4
48 0
49 5
50 -1
51 4
52 2
53 3
54 3
55 2
56 4
57 1
58 5
59 0
60 6
61 1
62 4
63 2
64 3
65 3
66 2
67 4
68 1
69 5
70 0
71 6
72 -1
73 5
74 2
75 4
76 3
77 3
78 4
79 2
80 5
81 1
82 6
83 0
84 7
85 1
86 5
87 2
88 4
89 3
90 3
91 4
92 2
93 5
94 1
95 6
96 0
97 7
98 -1
99 6
100 2
101 5
102 3
103 4
104 4
105 3
106 5
107 2
108 6
109 1
110 7
111 0
112 8
113 1
114 6
115 2
116 5
117 3
118 4
119 4
120 3
121 5
122 2
123 6
124 1
125 7
126 0
127 8
128 -1
129 7
130 2
131 6
132 3
133 5
134 4
135 4
136 5
137 3
138 6
139 2
140 7
141 1
142 8
143 0
144 9
145 1
146 7
147 2
148 6
149 3
150 5
151 4
152 4
153 5
154 3
155 6
156 2
157 7
158 1
159 8
160 0
161 9
162 -1

List of values

[1, -1, 0, 2, 1, 0, 2, -1, 1, 2, 0, 3, 1, 1, 2, 0, 3, -1, 2, 2, 1, 3, 0, 4, 1, 2, 2, 1, 3, 0, 4, -1, 3, 2, 2, 3, 1, 4, 0, 5, 1, 3, 2, 2, 3, 1, 4, 0, 5, -1, 4, 2, 3, 3, 2, 4, 1, 5, 0, 6, 1, 4, 2, 3, 3, 2, 4, 1, 5, 0, 6, -1, 5, 2, 4, 3, 3, 4, 2, 5, 1, 6, 0, 7, 1, 5, 2, 4, 3, 3, 4, 2, 5, 1, 6, 0, 7, -1, 6, 2, 5, 3, 4, 4, 3, 5, 2, 6, 1, 7, 0, 8, 1, 6, 2, 5, 3, 4, 4, 3, 5, 2, 6, 1, 7, 0, 8, -1, 7, 2, 6, 3, 5, 4, 4, 5, 3, 6, 2, 7, 1, 8, 0, 9, 1, 7, 2, 6, 3, 5, 4, 4, 5, 3, 6, 2, 7, 1, 8, 0, 9, -1]