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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.

A027302 a(n) = Sum_{k=0..floor((n-1)/2)} T(n,k) * T(n,k+1), with T given by A008315.

Table of values

n a(n)
1 1
2 2
3 9
4 24
5 95
6 286
7 1099
8 3536
9 13479
10 45220
11 172150
12 594320
13 2265003
14 7983990
15 30487175
16 109174560
17 417812417
18 1514797020
19 5810065898
20 21275014800
21 81775140083
22 301892460012
23 1162703549474
24 4321730134624
25 16675372590850
26 62340424959176
27 240949471232124

List of values

[1, 2, 9, 24, 95, 286, 1099, 3536, 13479, 45220, 172150, 594320, 2265003, 7983990, 30487175, 109174560, 417812417, 1514797020, 5810065898, 21275014800, 81775140083, 301892460012, 1162703549474, 4321730134624, 16675372590850, 62340424959176, 240949471232124]

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

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