A209499 Number of nX4 0..4 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.

15, 690, 78135, 9502354, 1165032679, 142937856372, 17538444837670, 2151975129988088, 264048573957784964, 32398910709148727392, 3975364904849935772656, 487779550353892225564624

Offset: 1

Author

R. H. Hardin Mar 09 2012

Keywords

• nonn

Comments

Column 4 of A209503

Examples

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

Links

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

Formula

Empirical: a(n) = 118*a(n-1) +1604*a(n-2) -127784*a(n-3) -79452*a(n-4) [phone]*a(n-5) -178547756*a(n-6) -2931053296*a(n-7) [phone]*a(n-8) [phone]*a(n-9) -495233537616*a(n-10) -1023076292096*a(n-11) [phone]*a(n-12) [phone]*a(n-13) -24309394624512*a(n-14) -36012394278144*a(n-15) [phone]*a(n-16) [phone]*a(n-17) -15907925311488*a(n-18) for n>19