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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.

A109000 Antidiagonal sums of square array A108998, in which row n equals the coordination sequence of B_n lattice.

Table of values

n a(n)
0 1
1 1
2 3
3 11
4 37
5 133
6 479
7 1719
8 6121
9 21609
10 75675
11 263171
12 909899
13 3130963
14 10730891
15 36639987
16 124528283
17 420319907
18 1403656123
19 4615627555
20 14868713515
21 46702912307
22 142489152555
23 421113970835
24 1203581558011

List of values

[1, 1, 3, 11, 37, 133, 479, 1719, 6121, 21609, 75675, 263171, 909899, 3130963, 10730891, 36639987, 124528283, 420319907, 1403656123, 4615627555, 14868713515, 46702912307, 142489152555, 421113970835, 1203581558011]

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

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