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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.

A171002 Binomial(n-k,k) * binomial(n-k-1,k+1) where k = ceiling(n/4).

Table of values

n a(n)
1 0
2 0
3 0
4 3
5 0
6 6
7 40
8 150
9 100
10 525
11 1960
12 5880
13 7056
14 26460
15 83160
16 228690
17 365904
18 1189188
19 3435432
20 9018009
21 17177160
22 51531480
23 141581440
24 361032672
25 773641440
26 2204878104
27 5859116640
28 14647791600
29 34178180400
30 93989996100
31 243891989880
32 601019546490

List of values

[0, 0, 0, 3, 0, 6, 40, 150, 100, 525, 1960, 5880, 7056, 26460, 83160, 228690, 365904, 1189188, 3435432, 9018009, 17177160, 51531480, 141581440, 361032672, 773641440, 2204878104, 5859116640, 14647791600, 34178180400, 93989996100, 243891989880, 601019546490]

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

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