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.

A118398 Eigenvector of the triangle defined by T(n,k) = 2^k*C(n,2*k) for 0<=k<=[n/2], n>=0.

Table of values

n a(n)
0 1
1 1
2 3
3 7
4 25
5 81
6 267
7 855
8 2865
9 9889
10 34963
11 124455
12 443977
13 1583089
14 5640603
15 20071287
16 71341665
17 253483329
18 901388067
19 3211744839
20 11477295225
21 41157734289
22 148140201003
23 535151245719
24 1939739625873
25 7051722637281

List of values

[1, 1, 3, 7, 25, 81, 267, 855, 2865, 9889, 34963, 124455, 443977, 1583089, 5640603, 20071287, 71341665, 253483329, 901388067, 3211744839, 11477295225, 41157734289, 148140201003, 535151245719, 1939739625873, 7051722637281]