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.

A381705 Length of iteration sequence of shortest unimodal Collatz (3x+1)/2 sequence that begins with exactly n increases and ends with continuous decreases until reaching 1.

Table of values

n a(n)
1 3
2 6
3 13
4 32
5 87
6 250
7 737
8 2196
9 6571
10 19694
11 59061
12 177160
13 531455
14 1594338
15 4782985
16 14348924
17 43046739
18 129140182
19 387420509
20 1162261488
21 3486784423
22 10460353226
23 31381059633
24 94143178852
25 282429536507
26 847288609470
27 2541865828357
28 7625597485016
29 22876792454991

List of values

[3, 6, 13, 32, 87, 250, 737, 2196, 6571, 19694, 59061, 177160, 531455, 1594338, 4782985, 14348924, 43046739, 129140182, 387420509, 1162261488, 3486784423, 10460353226, 31381059633, 94143178852, 282429536507, 847288609470, 2541865828357, 7625597485016, 22876792454991]

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

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