A198979 Number of nX5 0..5 arrays with values 0..5 introduced in row major order and no element equal to any horizontal or vertical neighbor.

15, 8731, 12662226, 19622872903, 30525244435834, 47495195899845037, 73900197917712351603, 114985169155743145765664, 178911424288565716160545667, 278377620790460864731769016202

Offset: 1

Author

R. H. Hardin Nov 01 2011

Keywords

• nonn

Comments

Column 5 of A198982

Examples

			Some solutions with all values from 0 to 5 for n=4
..0..1..0..2..3....0..1..2..3..4....0..1..2..1..0....0..1..2..3..2
..1..0..1..4..2....1..0..1..4..1....1..0..1..2..3....1..0..1..0..3
..0..3..0..3..1....0..3..0..3..0....0..3..0..1..2....0..3..0..4..0
..3..0..4..0..5....3..0..4..1..5....3..0..4..5..1....3..0..3..2..5
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..118

Formula

Empirical: a(n) = 1919*a(n-1) -618345*a(n-2) [phone]*a(n-3) -6569574565*a(n-4) [phone]*a(n-5) -6494675901838*a(n-6) [phone]*a(n-7) [phone]*a(n-8) -13348281831215275*a(n-9) +160607442902203491*a(n-10) -980646097424848279*a(n-11) +3301315800351613573*a(n-12) -5146582047324378787*a(n-13) -2530332306059747340*a(n-14) +26669206285409451180*a(n-15) -51683930686978851864*a(n-16) +51325265833875086656*a(n-17) -28242314477005082400*a(n-18) +8055054564912000000*a(n-19) -914531071104000000*a(n-20)