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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.

A342761 Fold a square sheet of paper alternately vertically to the left and horizontally downwards; after each fold, draw a line along each inward crease; after n folds, the resulting graph has a(n) edges.

Table of values

n a(n)
0 4
1 7
2 10
3 15
4 25
5 43
6 79
7 147
8 283
9 547
10 1075
11 2115
12 4195
13 8323
14 16579
15 33027
16 65923
17 131587
18 262915
19 525315
20 1050115
21 2099203
22 4197379
23 8392707
24 16783363
25 33562627
26 67121155
27 134234115
28 268460035
29 536903683
30 1073790979

List of values

[4, 7, 10, 15, 25, 43, 79, 147, 283, 547, 1075, 2115, 4195, 8323, 16579, 33027, 65923, 131587, 262915, 525315, 1050115, 2099203, 4197379, 8392707, 16783363, 33562627, 67121155, 134234115, 268460035, 536903683, 1073790979]

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

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