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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.

A358446 a(n) = n! * Sum_{k=0..floor(n/2)} 1/binomial(n-k, k).

Table of values

n a(n)
0 1
1 1
2 4
3 9
4 56
5 190
6 1704
7 7644
8 93120
9 516240
10 8136000
11 53523360
12 1047548160
13 7961241600
14 187132377600
15 1611967392000
16 44311886438400
17 426483893606400
18 13428757601280000
19 142790947407360000
20 5066854992138240000
21 58981696577556480000
22 2328441680297779200000

List of values

[1, 1, 4, 9, 56, 190, 1704, 7644, 93120, 516240, 8136000, 53523360, 1047548160, 7961241600, 187132377600, 1611967392000, 44311886438400, 426483893606400, 13428757601280000, 142790947407360000, 5066854992138240000, 58981696577556480000, 2328441680297779200000]

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

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