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.

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A232281 T(n,k)=Number of nXk 0..2 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.

Original entry on oeis.org

3, 3, 9, 9, 35, 27, 22, 199, 104, 81, 51, 1066, 1672, 341, 243, 121, 6019, 23055, 18117, 1189, 729, 292, 32301, 293426, 604133, 184115, 4040, 2187, 704, 174400, 3476318, 17145989, 14477600, 1774344, 13560, 6561, 1691, 944500, 43029161, 450287974
Offset: 1

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Author

R. H. Hardin, Nov 22 2013

Keywords

Comments

Table starts
.....3......3..........9............22...............51.................121
.....9.....35........199..........1066.............6019...............32301
....27....104.......1672.........23055...........293426.............3476318
....81....341......18117........604133.........17145989...........450287974
...243...1189.....184115......14477600........906702319.........52334662011
...729...4040....1774344.....340593196......47260154104.......6001447087200
..2187..13560...17764558....8229274953....2527067273698.....706877889324298
..6561..45803..178471267..198816273957..135096346014359...83179007080796381
.19683.155131.1771400531.4771778176334.7180729990183315.9733054114073214077

Examples

			Some solutions for n=3 k=4
..0..0..0..1....2..0..0..0....0..2..0..0....2..2..1..1....0..1..0..2
..1..0..1..2....2..0..0..0....0..0..0..0....1..1..2..2....2..0..0..0
..0..0..0..0....0..2..1..2....0..0..0..0....1..1..1..1....0..2..0..0
		

Crossrefs

Column 1 is A000244
Column 2 is A231645
Row 1 is A202882 for n>1

Formula

Empirical for column k:
k=1: a(n) = 3*a(n-1)
k=2: [order 11] for n>12
k=3: [order 35] for n>36
Empirical for row n:
n=1: a(n) = 3*a(n-1) -3*a(n-2) +4*a(n-3) -a(n-4) +a(n-5) for n>6
n=2: [order 10]
n=3: [order 52] for n>53
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