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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.

A024537 a(n) = floor( a(n-1)/(sqrt(2) - 1) ), with a(0) = 1.

Table of values

n a(n)
0 1
1 2
2 4
3 9
4 21
5 50
6 120
7 289
8 697
9 1682
10 4060
11 9801
12 23661
13 57122
14 137904
15 332929
16 803761
17 1940450
18 4684660
19 11309769
20 27304197
21 65918162
22 159140520
23 384199201
24 927538921
25 2239277042
26 5406093004
27 13051463049
28 31509019101
29 76069501250
30 183648021600

List of values

[1, 2, 4, 9, 21, 50, 120, 289, 697, 1682, 4060, 9801, 23661, 57122, 137904, 332929, 803761, 1940450, 4684660, 11309769, 27304197, 65918162, 159140520, 384199201, 927538921, 2239277042, 5406093004, 13051463049, 31509019101, 76069501250, 183648021600]

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

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