A239250 Number of nX2 0..4 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it, modulo 5.

13, 142, 1440, 14685, 150265, 1536541, 15708373, 160597823, 1641932577, 16786876051, 171626395117, 1754681817378, 17939597892019, 183411695776421, 1875173019958413, 19171481102053119, 196006279918074880

Offset

1,1

Comments

Column 2 of A239256

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 16*a(n-1) -78*a(n-2) +264*a(n-3) -870*a(n-4) +1596*a(n-5) -52*a(n-6) -7238*a(n-7) +36698*a(n-8) -130198*a(n-9) +247568*a(n-10) -332087*a(n-11) +481080*a(n-12) +81284*a(n-13) -1582141*a(n-14) +1105684*a(n-15) +830880*a(n-16) -102044*a(n-17) -849619*a(n-18) -1884476*a(n-19) +1023696*a(n-20) +3161818*a(n-21) -2161900*a(n-22) -2172976*a(n-23) +3526016*a(n-24) -1687296*a(n-25)

Example

Some solutions for n=5
..2..0....3..2....0..0....0..0....0..2....2..2....3..2....4..2....2..0....3..0
..0..4....2..1....3..2....0..3....0..4....2..1....3..0....3..0....4..2....0..2
..2..1....2..2....0..0....4..2....2..1....3..2....4..4....2..4....4..1....2..0
..3..2....2..2....3..2....4..3....2..0....2..2....4..4....3..1....0..3....4..2
..4..4....2..0....0..4....0..3....4..2....2..2....4..2....2..4....2..1....2..1

Crossrefs

Sequence in context: A045742 A122011 A221103 * A386612 A029483 A266806

Adjacent sequences: A239247 A239248 A239249 * A239251 A239252 A239253

Keyword

nonn

Author

R. H. Hardin, Mar 13 2014

Status

approved