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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.

A174993 a(n) = -Floor[n/2]! + Sum[(Eulerian[n - j, j]), {j, 0, Floor[n/2]}].

Table of values

n a(n)
1 0
2 0
3 1
4 4
5 11
6 36
7 119
8 443
9 1718
10 7245
11 32313
12 153730
13 771677
14 4088053
15 22741818
16 132596893
17 807840501
18 5132194862
19 33924901021
20 232905225561
21 1657803862422
22 12215420390037
23 93042805475305
24 731622623516178
25 5931914758691917
26 49535825763153373
27 425606813712984146
28 3758735172560999933
29 34089943206777076429
30 317245175458777517030

List of values

[0, 0, 1, 4, 11, 36, 119, 443, 1718, 7245, 32313, 153730, 771677, 4088053, 22741818, 132596893, 807840501, 5132194862, 33924901021, 232905225561, 1657803862422, 12215420390037, 93042805475305, 731622623516178, 5931914758691917, 49535825763153373, 425606813712984146, 3758735172560999933, 34089943206777076429, 317245175458777517030]

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

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