A251369 Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock summing to 1 2 3 4 5 6 or 7.

53769, 12002283, 2676962017, 597108952883, 133187012365193, 29707797738391051, 6626420822196876929, 1478044705717848217587, 329682676296148787924297, 73536792652326563411377515

Offset: 1

Author

R. H. Hardin, Dec 01 2014

Keywords

• nonn

Comments

Column 4 of A251373

Examples

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

Links

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

Formula

Empirical: a(n) = 200*a(n-1) +5284*a(n-2) -29042*a(n-3) -605899*a(n-4) +5424778*a(n-5) -14965624*a(n-6) [phone]*a(n-7) +6786256*a(n-8) -7898208*a(n-9) -2471040*a(n-10)