A217965 Number of 2Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..2 2Xn array.

9, 17, 91, 321, 1341, 5269, 21379, 85633, 344955, 1386679, 5579199, 22440525, 90271591, 363117835, 1460674773, 5875648527, 23635221447, 95074256043, 382442764281, 1538402105163, 6188327969265, 24892972759953, 100133687989929

Offset: 1

Author

R. H. Hardin Oct 16 2012

Keywords

• nonn

Comments

Row 2 of A217964

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..129

Formula

Empirical: a(n) = 2*a(n-1) +7*a(n-2) +6*a(n-3) -2*a(n-4) -10*a(n-5) -11*a(n-6) -32*a(n-7) -23*a(n-8) -16*a(n-9) +22*a(n-10) +4*a(n-11)