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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.

A158359 Triangle T(n,k) read by rows: coefficient [x^(n-k)] of the characteristic polynomial of the n X n matrix A(r,c)=1 (if c > r) and A(r,c)=c (if c <= r).

Table of values

n a(n)
0 1
1 1
2 -1
3 1
4 -3
5 1
6 1
7 -6
8 7
9 -2
10 1
11 -10
12 25
13 -23
14 6
15 1
16 -15
17 65
18 -123
19 98
20 -24
21 1
22 -21
23 140
24 -448
25 713
26 -514
27 120
28 1
29 -28
30 266
31 -1288
32 3401
33 -4792
34 3204
35 -720
36 1
37 -36
38 462
39 -3150
40 12417
41 -28599
42 36748
43 -23148
44 5040
45 1
46 -45
47 750
48 -6846
49 37617
50 -127935
51 265540
52 -317132
53 190224
54 -40320
55 1
56 -55

List of values

[1, 1, -1, 1, -3, 1, 1, -6, 7, -2, 1, -10, 25, -23, 6, 1, -15, 65, -123, 98, -24, 1, -21, 140, -448, 713, -514, 120, 1, -28, 266, -1288, 3401, -4792, 3204, -720, 1, -36, 462, -3150, 12417, -28599, 36748, -23148, 5040, 1, -45, 750, -6846, 37617, -127935, 265540, -317132, 190224, -40320, 1, -55]