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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.

A171006 Binomial(n-k-1,k) * binomial(n-k,k+1) where k = ceiling(n/4).

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 6
5 1
6 12
7 60
8 200
9 150
10 700
11 2450
12 7056
13 8820
14 31752
15 97020
16 261360
17 426888
18 1359072
19 3864861
20 10020010
21 19324305
22 57257200
23 155739584
24 393853824
25 851005584
26 2405321568
27 6347376360
28 15774544800
29 37026362100
30 101219995800
31 261312846300

List of values

[0, 0, 0, 1, 6, 1, 12, 60, 200, 150, 700, 2450, 7056, 8820, 31752, 97020, 261360, 426888, 1359072, 3864861, 10020010, 19324305, 57257200, 155739584, 393853824, 851005584, 2405321568, 6347376360, 15774544800, 37026362100, 101219995800, 261312846300]

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

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