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.

A365906 Irregular triangle T(n,k) read by rows, n>=1, k>=1, in which row n lists in nonincreasing order the sum of the b values (described in A365835) of the cells of every free polyomino with n cells.

Table of values

n a(n)
1 1
2 4
3 9
4 7
5 16
6 12
7 12
8 12
9 10
10 25
11 19
12 19
13 17
14 17
15 17
16 17
17 15
18 15
19 15
20 15
21 13
22 36
23 28
24 28
25 28
26 24
27 24
28 24
29 24
30 24
31 24
32 24
33 22
34 22
35 22
36 22
37 22
38 22
39 22
40 22
41 22
42 22
43 22
44 20
45 20
46 20
47 20
48 20
49 20
50 20
51 18
52 18
53 18
54 18
55 18
56 16
57 49
58 39
59 39
60 39
61 33
62 33
63 33
64 33
65 33
66 33

List of values

[1, 4, 9, 7, 16, 12, 12, 12, 10, 25, 19, 19, 17, 17, 17, 17, 15, 15, 15, 15, 13, 36, 28, 28, 28, 24, 24, 24, 24, 24, 24, 24, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 20, 20, 20, 20, 20, 20, 20, 18, 18, 18, 18, 18, 16, 49, 39, 39, 39, 33, 33, 33, 33, 33, 33]

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

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