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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.

A185871 (Even,even)-polka dot array in the natural number array A000027, by antidiagonals.

Table of values

n a(n)
1 5
2 12
3 14
4 23
5 25
6 27
7 38
8 40
9 42
10 44
11 57
12 59
13 61
14 63
15 65
16 80
17 82
18 84
19 86
20 88
21 90
22 107
23 109
24 111
25 113
26 115
27 117
28 119
29 138
30 140
31 142
32 144
33 146
34 148
35 150
36 152
37 173
38 175
39 177
40 179
41 181
42 183
43 185
44 187
45 189
46 212
47 214
48 216
49 218
50 220
51 222
52 224
53 226
54 228
55 230
56 255
57 257
58 259
59 261
60 263
61 265
62 267
63 269
64 271
65 273
66 275
67 302
68 304
69 306
70 308
71 310
72 312
73 314
74 316
75 318
76 320
77 322
78 324
79 353
80 355
81 357
82 359
83 361
84 363
85 365
86 367
87 369
88 371
89 373
90 375
91 377
92 408
93 410
94 412
95 414
96 416
97 418
98 420
99 422
100 424
101 426
102 428
103 430
104 432
105 434

List of values

[5, 12, 14, 23, 25, 27, 38, 40, 42, 44, 57, 59, 61, 63, 65, 80, 82, 84, 86, 88, 90, 107, 109, 111, 113, 115, 117, 119, 138, 140, 142, 144, 146, 148, 150, 152, 173, 175, 177, 179, 181, 183, 185, 187, 189, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 302, 304, 306, 308, 310, 312, 314, 316, 318, 320, 322, 324, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 408, 410, 412, 414, 416, 418, 420, 422, 424, 426, 428, 430, 432, 434]