cp's OEIS Frontend

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.

A089481 Triangle T(n,k) read by rows, where T(n,k) = number of times the permanent of a real singular n X n (0,1)-matrix takes the value k, for n >= 2, 0 <= k <= n!.

Table of values

n a(n)
2 9
3 0
4 1
5 265
6 0
7 63
8 0
9 9
10 0
11 1
12 27713
13 0
14 9360
15 0
16 3582
17 0
18 1248
19 0
20 648
21 0
22 288
23 0
24 48
25 0
26 72
27 0
28 0
29 0
30 16
31 0
32 0
33 0
34 0
35 0
36 1
37 10363361
38 0
39 3645600
40 0
41 2411250
42 0
43 1404800
44 0
45 1043700
46 0
47 682200
48 0
49 417100
50 0
51 336600
52 0
53 177750
54 0
55 183400
56 0
57 85950
58 0
59 60000
60 0

List of values

[9, 0, 1, 265, 0, 63, 0, 9, 0, 1, 27713, 0, 9360, 0, 3582, 0, 1248, 0, 648, 0, 288, 0, 48, 0, 72, 0, 0, 0, 16, 0, 0, 0, 0, 0, 1, 10363361, 0, 3645600, 0, 2411250, 0, 1404800, 0, 1043700, 0, 682200, 0, 417100, 0, 336600, 0, 177750, 0, 183400, 0, 85950, 0, 60000, 0]