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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.

A072547 Main diagonal of the array in which first column and row are filled alternatively with 1's or 0's and then T(i,j) = T(i-1,j) + T(i,j-1).

Table of values

n a(n)
1 1
2 0
3 2
4 6
5 22
6 80
7 296
8 1106
9 4166
10 15792
11 60172
12 230252
13 884236
14 3406104
15 13154948
16 50922986
17 197519942
18 767502944
19 2987013068
20 11641557716
21 45429853652
22 177490745984
23 694175171648
24 2717578296116
25 10648297329692
26 41757352712480

List of values

[1, 0, 2, 6, 22, 80, 296, 1106, 4166, 15792, 60172, 230252, 884236, 3406104, 13154948, 50922986, 197519942, 767502944, 2987013068, 11641557716, 45429853652, 177490745984, 694175171648, 2717578296116, 10648297329692, 41757352712480]

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

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