81921

Appears in sequences

• a(n) = A024727(n+3)/4.at n=16A024728
• Expansion of 1/((1-4x)(1-6x)(1-7x)(1-10x)).at n=4A028132
• a(0) = 6; for n>0, a(n) = 2*a(n-1) - 1.at n=14A083575
• G.f.: (1+x)/Product_{m>0} (1 - x^m).at n=41A084376
• a(n) = (A001317(2n)-1)/4.at n=9A089893
• Results from a change in the rules leading to sequence A097357.at n=16A110565
• a(n) = 80*n^2 + 1.at n=32A158776
• a(0)=0; thereafter a(n) = (3*n+1)*2^(n-2)+1.at n=14A170881
• a(n) = 5*4^n+1.at n=7A199115
• Numbers containing only 1's and 0's in their base-2, base-3, and base-4 representations.at n=23A258981
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 774", based on the 5-celled von Neumann neighborhood.at n=16A283913
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 806", based on the 5-celled von Neumann neighborhood.at n=16A284144
• Number of nX4 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 king-move adjacent elements, with upper left element zero.at n=8A304351
• Integers of the form k*2^m + 1 where 0 < k <= m and k is odd.at n=51A361875