OFFSET
1,3
COMMENTS
Row 3 of A181274.
LINKS
R. H. Hardin, Table of n, a(n) for n=1..144
FORMULA
Empirical (for n>=3): 3*2^(3*n-7) + (18*n - 105 - 17*(-1)^n)*4^(n-4)/3 - (6*n - 19 - 3*(-1)^n)*2^(n-5)/3. - Vaclav Kotesovec, Nov 27 2012
Conjectures from Colin Barker, Mar 27 2018: (Start)
G.f.: x^3*(9 - 47*x - 16*x^2 + 124*x^3 + 224*x^4 - 320*x^5 + 512*x^6) / ((1 - 2*x)^2*(1 + 2*x)*(1 - 4*x)^2*(1 + 4*x)*(1 - 8*x)).
a(n) = 14*a(n-1) - 36*a(n-2) - 216*a(n-3) + 1056*a(n-4) - 384*a(n-5) - 3584*a(n-6) + 4096*a(n-7) for n>9.
(End)
EXAMPLE
M and M*Mtranspose (mod 2) for 3 X 3:
..0..1..0......1..1..0
..0..1..1......1..0..0
..1..0..0......0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 10 2010
STATUS
approved