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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.

A084075 Length of list created by n substitutions k -> Range( -abs(k+1), abs(k-1), 2) starting with {1}.

Table of values

n a(n)
0 1
1 2
2 5
3 12
4 33
5 86
6 249
7 680
8 2033
9 5722
10 17485
11 50260
12 156033
13 455534
14 1431281
15 4228752
16 13412193
17 40003058
18 127840085
19 384232156
20 1235575201
21 3737280582
22 12080678505
23 36736735672
24 119276490193
25 364372758986
26 1187542872989

List of values

[1, 2, 5, 12, 33, 86, 249, 680, 2033, 5722, 17485, 50260, 156033, 455534, 1431281, 4228752, 13412193, 40003058, 127840085, 384232156, 1235575201, 3737280582, 12080678505, 36736735672, 119276490193, 364372758986, 1187542872989]

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

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