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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.

A188140 Central coefficient in (1 + x + 2^n*x^2)^n.

Table of values

n a(n)
0 1
1 1
2 9
3 49
4 1729
5 31361
6 5613441
7 297047297
8 310070491137
9 43518954344449
10 287194749188794369
11 100075094464681701377
12 4382651775014102039543809
13 3633063629528650538489708545
14 1089270933915429450356021881831425

List of values

[1, 1, 9, 49, 1729, 31361, 5613441, 297047297, 310070491137, 43518954344449, 287194749188794369, 100075094464681701377, 4382651775014102039543809, 3633063629528650538489708545, 1089270933915429450356021881831425]

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

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