18082

Appears in sequences

• Starting from generation 8 add previous and next term yielding generation 9.at n=19A048455
• a(n) = -a(n-1) - a(n-2) + a(n-3), a(0)=0, a(1)=0, a(2)=1.at n=37A057597
• McKay-Thompson series of class 18a for Monster.at n=60A058536
• McKay-Thompson series of class 18d for the Monster group.at n=20A058539
• Centered 21-gonal numbers.at n=41A069178
• Numbers n such that h(n) = 2 h(n-1) where h(n) is the length of the sequence {n, f(n), f(f(n)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)at n=31A078419
• Triangle, read by rows, where the n-th diagonal equals the n-th row transformed by triangle A008459 (squared binomial coefficients).at n=73A097084
• a(n) = a(n-1) + a(n-2) + a(n-3); a(0) = -1, a(1) = 2, a(2) = 2.at n=17A100683
• Number of partitions of n, where the difference between the number of odd parts and the number of even parts is 8.at n=47A240017
• Number of twos minus number of ones in the first 2^n entries of the Kolakoski sequence, A000002.at n=35A289323
• G.f.: Product_{k>=1, j>=1} (1 + x^(k*j))^2.at n=16A320235