cp's OEIS Frontend

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.

A027303 a(n) = Sum_{k=0..floor((n-3)/2)} T(n,k) * T(n,k+2), with T given by A008315.

Table of values

n a(n)
3 2
4 5
5 34
6 98
7 496
8 1545
9 7010
10 22924
11 98636
12 333463
13 1393014
14 4824350
15 19795200
16 69818507
17 283195638
18 1013208668
19 4078132240
20 14758843463
21 59087809638
22 215859015800
23 860951003152
24 3169965920150
25 12609168181324
26 46735070397768
27 185532421441976
28 691582241867227

List of values

[2, 5, 34, 98, 496, 1545, 7010, 22924, 98636, 333463, 1393014, 4824350, 19795200, 69818507, 283195638, 1013208668, 4078132240, 14758843463, 59087809638, 215859015800, 860951003152, 3169965920150, 12609168181324, 46735070397768, 185532421441976, 691582241867227]

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

Content is available under The OEIS End-User License Agreement.