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.

A152884 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} with excedance set equal to the k-th subset of {1,2,...,n-1} (n>=0, 0<=k<=ceiling(2^(n-1))-1). The subsets of {1,2,...,n-1} are ordered according to size, while the subsets of the same size follow the lexicographic order.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 3
6 1
7 1
8 1
9 7
10 3
11 1
12 7
13 3
14 1
15 1
16 1
17 15
18 7
19 3
20 1
21 31
22 17
23 7
24 7
25 3
26 1
27 15
28 7
29 3
30 1
31 1
32 1
33 31
34 15
35 7
36 3
37 1
38 115
39 69
40 37
41 15
42 31
43 17
44 7
45 7
46 3
47 1
48 115
49 69
50 31
51 37
52 17
53 7
54 15
55 7
56 3
57 1
58 31
59 15
60 7
61 3
62 1
63 1
64 1
65 63
66 31
67 15
68 7
69 3
70 1
71 391
72 245
73 145
74 77
75 31
76 115
77 69
78 37
79 15
80 31
81 17
82 7
83 7
84 3
85 1

List of values

[1, 1, 1, 1, 1, 3, 1, 1, 1, 7, 3, 1, 7, 3, 1, 1, 1, 15, 7, 3, 1, 31, 17, 7, 7, 3, 1, 15, 7, 3, 1, 1, 1, 31, 15, 7, 3, 1, 115, 69, 37, 15, 31, 17, 7, 7, 3, 1, 115, 69, 31, 37, 17, 7, 15, 7, 3, 1, 31, 15, 7, 3, 1, 1, 1, 63, 31, 15, 7, 3, 1, 391, 245, 145, 77, 31, 115, 69, 37, 15, 31, 17, 7, 7, 3, 1]