A204074 Number of (n+1)X7 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.

23438, 1944977, 173848010, 15960507749, 1480470688070, 137884925726873, 12862680257580962, 1200667125506097389, 112104534764514944606, 10468081339649563612769, 977525613860679565008506

Offset: 1

Author

R. H. Hardin Jan 10 2012

Keywords

• nonn

Comments

Column 6 of A204076

Examples

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

Links

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

Formula

Empirical: a(n) = 118*a(n-1) -731*a(n-2) -192994*a(n-3) +4365504*a(n-4) +7243432*a(n-5) -853595552*a(n-6) [phone]*a(n-7) [phone]*a(n-8) -407296962944*a(n-9) -429798333440*a(n-10) [phone]*a(n-11) -17466577684480*a(n-12) -111724579282944*a(n-13) [phone]*a(n-14) [phone]*a(n-15) -1868808138063872*a(n-16) [phone]*a(n-17) +4652179449380864*a(n-18) -2844522127687680*a(n-19) -5181635339747328*a(n-20) +4553597538271232*a(n-21) +2457666202894336*a(n-22) -2755619987652608*a(n-23) -413275992883200*a(n-24) [phone]*a(n-25) -18283340234752*a(n-26) -55383771054080*a(n-27) [phone]*a(n-28) -260919263232*a(n-29)