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.

A297646 Heptagonal numbers (A000566) in which parity of digits alternates.

Table of values

n a(n)
1 1
2 7
3 18
4 34
5 81
6 189
7 616
8 783
9 874
10 3010
11 4141
12 4347
13 5452
14 6943
15 8323
16 12145
17 14707
18 18361
19 52345
20 69472
21 74563
22 78943
23 96727
24 129618
25 147258
26 163456
27 214183
28 232105
29 250747
30 258727
31 270109
32 276723
33 278389
34 307476
35 309232
36 381616
37 389470
38 436183
39 450925

List of values

[1, 7, 18, 34, 81, 189, 616, 783, 874, 3010, 4141, 4347, 5452, 6943, 8323, 12145, 14707, 18361, 52345, 69472, 74563, 78943, 96727, 129618, 147258, 163456, 214183, 232105, 250747, 258727, 270109, 276723, 278389, 307476, 309232, 381616, 389470, 436183, 450925]