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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.

A010907 Pisot sequence E(4,19), a(n) = floor( a(n-1)^2/a(n-2)+1/2 ).

Table of values

n a(n)
0 4
1 19
2 90
3 426
4 2016
5 9541
6 45154
7 213697
8 1011348
9 4786332
10 22651920
11 107203069
12 507352048
13 2401107571
14 11363544486
15 53779407822
16 254517831936
17 1204537747753
18 5700626846950
19 26978935702753
20 127681216679304
21 604267465267128
22 2859772009358880
23 13534231802298265
24 64052459384483260
25 303136344428812723
26 1434630991482656082
27 6789572149788327282

List of values

[4, 19, 90, 426, 2016, 9541, 45154, 213697, 1011348, 4786332, 22651920, 107203069, 507352048, 2401107571, 11363544486, 53779407822, 254517831936, 1204537747753, 5700626846950, 26978935702753, 127681216679304, 604267465267128, 2859772009358880, 13534231802298265, 64052459384483260, 303136344428812723, 1434630991482656082, 6789572149788327282]

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

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