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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.

A371430 Expansion of (1/x) * Series_Reversion( x / ((1+x)^4 - x^2) ).

Table of values

n a(n)
0 1
1 4
2 21
3 128
4 851
5 5984
6 43759
7 329396
8 2535406
9 19863592
10 157874971
11 1269833668
12 10316765299
13 84540929568
14 697928139977
15 5799156785376
16 48461097907978
17 407020852551016
18 3434002483872566
19 29090171931564848
20 247333930963224287
21 2109921586071433064

List of values

[1, 4, 21, 128, 851, 5984, 43759, 329396, 2535406, 19863592, 157874971, 1269833668, 10316765299, 84540929568, 697928139977, 5799156785376, 48461097907978, 407020852551016, 3434002483872566, 29090171931564848, 247333930963224287, 2109921586071433064]

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

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