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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.

A155826 Triangle T(n, k) = binomial(n, k) + binomial(k*(n-k), n) + 2*(-1)^n*StirlingS1(n, k)*StirlingS1(n, n-k), read by rows.

Table of values

n a(n)
0 4
1 1
2 1
3 1
4 4
5 1
6 1
7 15
8 15
9 1
10 1
11 76
12 249
13 76
14 1
15 1
16 485
17 3516
18 3516
19 485
20 1
21 1
22 3606
23 46623
24 101354
25 46623
26 3606
27 1
28 1
29 30247
30 617541
31 2388107
32 2388107
33 617541
34 30247
35 1
36 1
37 282248
38 8416315
39 51483931
40 91651662
41 51483931
42 8416315
43 282248
44 1
45 1
46 2903049
47 119667766
48 1071669632
49 3021085118
50 3021085118
51 1071669632
52 119667766
53 2903049
54 1

List of values

[4, 1, 1, 1, 4, 1, 1, 15, 15, 1, 1, 76, 249, 76, 1, 1, 485, 3516, 3516, 485, 1, 1, 3606, 46623, 101354, 46623, 3606, 1, 1, 30247, 617541, 2388107, 2388107, 617541, 30247, 1, 1, 282248, 8416315, 51483931, 91651662, 51483931, 8416315, 282248, 1, 1, 2903049, 119667766, 1071669632, 3021085118, 3021085118, 1071669632, 119667766, 2903049, 1]

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

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