OFFSET
1,2
LINKS
J. Borowska, L. Lacinska, Recurrence form of determinant of a heptadiagonal symmetric Toeplitz matrix, J. Appl. Math. Comp. Mech. 13 (2014) 19-16, remark 1 a=c=1, b=2.
Index entries for linear recurrences with constant coefficients, signature (0,-3,3,0,1).
FORMULA
G.f.: -x*(1-3*x+x^4+3*x^2) / ( (x-1)*(x^4+x^3+4*x^2+x+1) ).
PROG
(PARI) x=1; y=2; z=1; for(n=1, 80, print1(matdet(matrix(n, n, i, j, if(abs(i-j)-1, 0, y)+if(abs(i-j)-2, 0, z)+if(abs(i-j), 0, x))), ", "))
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Benoit Cloitre, Jun 20 2002
STATUS
approved