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.

A286897 Sum T(n,k) of the k-th last entries in all blocks of all set partitions of [n]; triangle T(n,k), n>=1, 1<=k<=n, read by rows.

Table of values

n a(n)
1 1
2 5
3 1
4 23
5 6
6 1
7 109
8 33
9 7
10 1
11 544
12 182
13 45
14 8
15 1
16 2876
17 1034
18 284
19 59
20 9
21 1
22 16113
23 6122
24 1815
25 420
26 75
27 10
28 1
29 95495
30 37927
31 11931
32 2987
33 595
34 93
35 11
36 1
37 597155
38 246030
39 81205
40 21620
41 4665
42 814
43 113
44 12
45 1
46 3929243
47 1669941
48 573724
49 160607
50 36900
51 6979
52 1082
53 135
54 13
55 1

List of values

[1, 5, 1, 23, 6, 1, 109, 33, 7, 1, 544, 182, 45, 8, 1, 2876, 1034, 284, 59, 9, 1, 16113, 6122, 1815, 420, 75, 10, 1, 95495, 37927, 11931, 2987, 595, 93, 11, 1, 597155, 246030, 81205, 21620, 4665, 814, 113, 12, 1, 3929243, 1669941, 573724, 160607, 36900, 6979, 1082, 135, 13, 1]