An extension of Knuth's Fibonacci multiplication to recurrences G(k+d)
= a1G(k+d-1) + ... + a(d)G(k) with a1 greater-than-or-equal-to a2 gre
ater-than-or-equal-to ... greater-than-or-equal-to a(d) > 0 and ''cano
nical'' initial values G(k) = a1G(k-1) + a2G(k-2) + ... + a(k)G0 + 1,
0 less-than-or-equal-to k < d is established. We prove associativity f
or this multiplication if a related parameter is chosen sufficiently l
arge.