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.

A248431 Number of length n+2 0..6 arrays with every three consecutive terms having the sum of some two elements equal to twice the third.

Table of values

n a(n)
1 61
2 105
3 185
4 327
5 601
6 1105
7 2021
8 3761
9 6969
10 12815
11 23897
12 44337
13 81597
14 152209
15 282457
16 519895
17 969849
18 1799825
19 3312853
20 6180081
21 11468921
22 21110367
23 39381145
24 73083121
25 134521133
26 250947665
27 465706137
28 857206439
29 1599109049
30 2967610449

List of values

[61, 105, 185, 327, 601, 1105, 2021, 3761, 6969, 12815, 23897, 44337, 81597, 152209, 282457, 519895, 969849, 1799825, 3312853, 6180081, 11468921, 21110367, 39381145, 73083121, 134521133, 250947665, 465706137, 857206439, 1599109049, 2967610449]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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