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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.

A368967 Expansion of (1/x) * Series_Reversion( x * (1-x)^2 * (1-x-x^2)^2 ).

Table of values

n a(n)
0 1
1 4
2 28
3 238
4 2244
5 22568
6 237199
7 2574276
8 28627224
9 324503718
10 3735672880
11 43555658640
12 513277420803
13 6103767231712
14 73153216133600
15 882708243017414
16 10714917867247020
17 130752597362068496
18 1603069096165788706
19 19737123968746454284
20 243930175282166574432

List of values

[1, 4, 28, 238, 2244, 22568, 237199, 2574276, 28627224, 324503718, 3735672880, 43555658640, 513277420803, 6103767231712, 73153216133600, 882708243017414, 10714917867247020, 130752597362068496, 1603069096165788706, 19737123968746454284, 243930175282166574432]

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

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