78568domain: NAppears in sequencesNumber of reduced words of length n in the infinite affine Weyl group (E_6)^{~} on 7 generators.at n=18A161410a(n) is the least integer k such that k/Fibonacci(n) > 2/5.at n=27A293640a(n) = a(n-1) + 2*a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.at n=17A298415