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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.

A028243 a(n) = 3^(n-1) - 2^n + 1 (essentially Stirling numbers of second kind).

Table of values

n a(n)
1 0
2 0
3 2
4 12
5 50
6 180
7 602
8 1932
9 6050
10 18660
11 57002
12 173052
13 523250
14 1577940
15 4750202
16 14283372
17 42915650
18 128878020
19 386896202
20 1161212892
21 3484687250
22 10456158900
23 31372671002
24 94126401612
25 282395982050
26 847221500580
27 2541731610602
28 7625329049532

List of values

[0, 0, 2, 12, 50, 180, 602, 1932, 6050, 18660, 57002, 173052, 523250, 1577940, 4750202, 14283372, 42915650, 128878020, 386896202, 1161212892, 3484687250, 10456158900, 31372671002, 94126401612, 282395982050, 847221500580, 2541731610602, 7625329049532]

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

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