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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.

A277874 a(n) is the last number in the (2n+1)-element alternating sequence of x/2 and (3x+1) iterations starting with A277215(n).

Table of values

n a(n)
0 0
1 40
2 16
3 52
4 160
5 9232
6 18952
7 4372
8 13120
9 39364
10 118096
11 2480056
12 5314408
13 35075104
14 9565936
15 28697812
16 86093440
17 1807962280
18 8523250756
19 2324522932
20 6973568800
21 20920706404
22 62762119216
23 188286357652
24 564859072960
25 11862040532200
26 25418658283288
27 15251194969972
28 45753584909920
29 960825283108360

List of values

[0, 40, 16, 52, 160, 9232, 18952, 4372, 13120, 39364, 118096, 2480056, 5314408, 35075104, 9565936, 28697812, 86093440, 1807962280, 8523250756, 2324522932, 6973568800, 20920706404, 62762119216, 188286357652, 564859072960, 11862040532200, 25418658283288, 15251194969972, 45753584909920, 960825283108360]

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

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