A218523 Number of 2Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..3 2Xn array.

16, 36, 286, 1348, 7902, 42812, 242438, 1349524, 7567448, 42328892, 237017542, 1326679924, 7427188036, 41577119948, 232754004212, 1302972323234, 7294158727224, 40833303099488, 228588363496794, 1279657095800040

Offset: 1

Author

R. H. Hardin Oct 31 2012

Keywords

• nonn

Comments

Row 2 of A218522

Examples

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

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +17*a(n-2) +26*a(n-3) -19*a(n-4) -123*a(n-5) -138*a(n-6) -248*a(n-7) -329*a(n-8) +41*a(n-9) +1108*a(n-10) +1469*a(n-11) -54*a(n-12) -1158*a(n-13) -316*a(n-14) +144*a(n-15) +32*a(n-16)