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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.

A093387 a(n) = 2^(n-1) - binomial(n, floor(n/2)).

Table of values

n a(n)
1 0
2 0
3 1
4 2
5 6
6 12
7 29
8 58
9 130
10 260
11 562
12 1124
13 2380
14 4760
15 9949
16 19898
17 41226
18 82452
19 169766
20 339532
21 695860
22 1391720
23 2842226
24 5684452
25 11576916
26 23153832
27 47050564
28 94101128
29 190876696
30 381753392
31 773201629
32 1546403258
33 3128164186
34 6256328372
35 12642301534

List of values

[0, 0, 1, 2, 6, 12, 29, 58, 130, 260, 562, 1124, 2380, 4760, 9949, 19898, 41226, 82452, 169766, 339532, 695860, 1391720, 2842226, 5684452, 11576916, 23153832, 47050564, 94101128, 190876696, 381753392, 773201629, 1546403258, 3128164186, 6256328372, 12642301534]

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

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