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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.

A189456 Number of 8Xn array permutations with each element moving zero or one space horizontally or diagonally.

Table of values

n a(n)
1 1
2 1597
3 250000
4 106834338
5 33995627281
6 12362821462925
7 4329976369716644
8 1544933702911323688
9 548904049287782685569
10 195559483332882314913741
11 69650888604936997141340729
12 24818320628803632672710482237

List of values

[1, 1597, 250000, 106834338, 33995627281, 12362821462925, 4329976369716644, 1544933702911323688, 548904049287782685569, 195559483332882314913741, 69650888604936997141340729, 24818320628803632672710482237]

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

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