OFFSET
1,2
COMMENTS
It seems that this is also the first row of the spectral array W(sqrt(26)-4).
It also seems that, for all k>0, the first row of W(sqrt(k^2+1)-k+1) has a generating function of the form x*(1+(2*k+1)*x-2*k*x^3)/(1-(2*k+2)*x^2+2*k*x^4).
LINKS
Colin Barker, Table of n, a(n) for n = 1..1000
A. Fraenkel and C. Kimberling, Generalized Wythoff arrays, shuffles and interspersions, Discrete Mathematics 126 (1994) 137-149.
Index entries for linear recurrences with constant coefficients, signature (0,12,0,-10).
FORMULA
a(1)=1, a(2)=11, a(3)=12, a(4)=122, a(n)=12*a(n-2)-10*a(n-4). - Harvey P. Dale, Feb 02 2015
MATHEMATICA
LinearRecurrence[{0, 12, 0, -10}, {1, 11, 12, 122}, 40] (* Harvey P. Dale, Feb 02 2015 *)
PROG
(PARI) Vec(x*(1+11*x-10*x^3)/(1-12*x^2+10*x^4) + O(x^100))
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Colin Barker, Oct 25 2014
STATUS
approved