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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.

A051708 Number of ways to move a chess rook from the lower left corner to square (n,n), with the rook moving only up or right.

Table of values

n a(n)
1 1
2 2
3 14
4 106
5 838
6 6802
7 56190
8 470010
9 3968310
10 33747490
11 288654574
12 2480593546
13 21400729382
14 185239360178
15 1607913963614
16 13991107041306
17 122002082809110
18 1065855419418690
19 9327252391907790
20 81744134786314410
21 717367363052796678
22 6303080714967178962

List of values

[1, 2, 14, 106, 838, 6802, 56190, 470010, 3968310, 33747490, 288654574, 2480593546, 21400729382, 185239360178, 1607913963614, 13991107041306, 122002082809110, 1065855419418690, 9327252391907790, 81744134786314410, 717367363052796678, 6303080714967178962]

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

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