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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.

A139243 Second differences of Mersenne numbers A001348, divided by 4.

Table of values

n a(n)
1 5
2 18
3 456
4 1056
5 29184
6 67584
7 1867776
8 130154496
9 270532608
10 33420214272
11 481573208064
12 1133871366144
13 31336081391616
14 2183630092763136
15 139646772820574208
16 290482175965396992
17 35884681830888112128
18 517085294816170868736
19 1217485108864830406656

List of values

[5, 18, 456, 1056, 29184, 67584, 1867776, 130154496, 270532608, 33420214272, 481573208064, 1133871366144, 31336081391616, 2183630092763136, 139646772820574208, 290482175965396992, 35884681830888112128, 517085294816170868736, 1217485108864830406656]

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

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