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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.

A295870 a(n) = binomial(3n,n)*CQC(n), where CQC(n) = A005721(n) = A005190(2n) is a central quadrinomial coefficient.

Table of values

n a(n)
0 1
1 12
2 660
3 48720
4 4005540
5 349260912
6 31626298704
7 2940502593600
8 278788387440420
9 26831860080682800
10 2613367831568654160
11 257012469788428710720
12 25479526081439438845200
13 2543092744417831625342400
14 255292245777771431285140800
15 25755871314484468746363582720

List of values

[1, 12, 660, 48720, 4005540, 349260912, 31626298704, 2940502593600, 278788387440420, 26831860080682800, 2613367831568654160, 257012469788428710720, 25479526081439438845200, 2543092744417831625342400, 255292245777771431285140800, 25755871314484468746363582720]

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

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