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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.

A379021 Expansion of (1/x) * Series_Reversion( x * ((1 - x - x^2)/(1 + x))^2 ).

Table of values

n a(n)
0 1
1 4
2 26
3 206
4 1813
5 17032
6 167287
7 1697044
8 17643322
9 186997570
10 2012973499
11 21948003052
12 241883091289
13 2690117648372
14 30153678822007
15 340305271736134
16 3863616751855069
17 44097785533620550
18 505692279260755753
19 5823592506326814874
20 67320958983831426221

List of values

[1, 4, 26, 206, 1813, 17032, 167287, 1697044, 17643322, 186997570, 2012973499, 21948003052, 241883091289, 2690117648372, 30153678822007, 340305271736134, 3863616751855069, 44097785533620550, 505692279260755753, 5823592506326814874, 67320958983831426221]

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

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