cp's OEIS Frontend

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.

A306616 Integers k such that phi(Catalan(k+1)) = 4*phi(Catalan(k)) where phi is A000010 and Catalan is A000108.

Table of values

n a(n)
1 2
2 8
3 19
4 20
5 36
6 42
7 44
8 55
9 56
10 76
11 91
12 109
13 116
14 120
15 140
16 143
17 152
18 156
19 176
20 184
21 200
22 204
23 213
24 216
25 224
26 235
27 242
28 260
29 289
30 296
31 300
32 380
33 384
34 400
35 401
36 415
37 436
38 464
39 469
40 476
41 524
42 547
43 553
44 564
45 595
46 602
47 616
48 624
49 630
50 631
51 660
52 685
53 704
54 716
55 744
56 776
57 800

List of values

[2, 8, 19, 20, 36, 42, 44, 55, 56, 76, 91, 109, 116, 120, 140, 143, 152, 156, 176, 184, 200, 204, 213, 216, 224, 235, 242, 260, 289, 296, 300, 380, 384, 400, 401, 415, 436, 464, 469, 476, 524, 547, 553, 564, 595, 602, 616, 624, 630, 631, 660, 685, 704, 716, 744, 776, 800]

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

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