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.

A138269 a(n+1) is the Hankel transform of C(n)+C(n+2), where C(n) = A000108(n).

Table of values

n a(n)
0 1
1 3
2 12
3 53
4 231
5 1000
6 4329
7 18747
8 81188
9 351597
10 1522639
11 6594000
12 28556241
13 123666803
14 535556412
15 2319302053
16 10044062391
17 43497219000
18 188370799289
19 815766130347
20 3532789487188
21 15299239691997

List of values

[1, 3, 12, 53, 231, 1000, 4329, 18747, 81188, 351597, 1522639, 6594000, 28556241, 123666803, 535556412, 2319302053, 10044062391, 43497219000, 188370799289, 815766130347, 3532789487188, 15299239691997]

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

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