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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.

A107373 a(n) = (n/2)*binomial(n-1, floor((n-1)/2)) - 2^(n-2).

Table of values

n a(n)
1 0
2 0
3 1
4 2
5 7
6 14
7 38
8 76
9 187
10 374
11 874
12 1748
13 3958
14 7916
15 17548
16 35096
17 76627
18 153254
19 330818
20 661636
21 1415650
22 2831300
23 6015316
24 12030632
25 25413342
26 50826684
27 106853668
28 213707336
29 447472972
30 894945944
31 1867450648
32 3734901296
33 7770342787
34 15540685574

List of values

[0, 0, 1, 2, 7, 14, 38, 76, 187, 374, 874, 1748, 3958, 7916, 17548, 35096, 76627, 153254, 330818, 661636, 1415650, 2831300, 6015316, 12030632, 25413342, 50826684, 106853668, 213707336, 447472972, 894945944, 1867450648, 3734901296, 7770342787, 15540685574]

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

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