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.

A105795 Shallow diagonal sums of the triangle k!*Stirling2(n,k): a(n) = Sum_{k=0..floor(n/2)} T(n-k,k) where T is A019538.

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 3
5 7
6 21
7 67
8 237
9 907
10 3741
11 16507
12 77517
13 385627
14 2024301
15 11174587
16 64673997
17 391392667
18 2470864941
19 16237279867
20 110858862477
21 784987938907
22 5755734591981
23 43636725010747
24 341615028340557
25 2758165832945947
26 22940755633301421
27 196354180631212027

List of values

[1, 0, 1, 1, 3, 7, 21, 67, 237, 907, 3741, 16507, 77517, 385627, 2024301, 11174587, 64673997, 391392667, 2470864941, 16237279867, 110858862477, 784987938907, 5755734591981, 43636725010747, 341615028340557, 2758165832945947, 22940755633301421, 196354180631212027]

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

Content is available under The OEIS End-User License Agreement.