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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.

A027296 a(n) = Sum_{k=0..floor((n-1)/2)} T(n,k) * T(n,k+2), with T given by A026022.

Table of values

n a(n)
2 1
3 6
4 22
5 100
6 345
7 1470
8 5096
9 21120
10 74175
11 302698
12 1076922
13 4352140
14 15660827
15 62876490
16 228468272
17 913093664
18 3345466023
19 13326904266
20 49176362780
21 195434713432
22 725586231766
23 2878605745972
24 10744342665072
25 42571577779200
26 159638882959595
27 631933882236306

List of values

[1, 6, 22, 100, 345, 1470, 5096, 21120, 74175, 302698, 1076922, 4352140, 15660827, 62876490, 228468272, 913093664, 3345466023, 13326904266, 49176362780, 195434713432, 725586231766, 2878605745972, 10744342665072, 42571577779200, 159638882959595, 631933882236306]

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

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