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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.

A371404 Expansion of (1/x) * Series_Reversion( x / ( (1+x) * (1+3*x)^2 ) ).

Table of values

n a(n)
0 1
1 7
2 64
3 667
4 7513
5 89092
6 1095832
7 13852195
8 178855075
9 2348744095
10 31273438804
11 421224534100
12 5728966150924
13 78569975545432
14 1085350298162608
15 15087689038165555
16 210907141968410071
17 2962825568825439349
18 41806163408065511032
19 592244891188614804643

List of values

[1, 7, 64, 667, 7513, 89092, 1095832, 13852195, 178855075, 2348744095, 31273438804, 421224534100, 5728966150924, 78569975545432, 1085350298162608, 15087689038165555, 210907141968410071, 2962825568825439349, 41806163408065511032, 592244891188614804643]

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

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