20704

Appears in sequences

• a(n) = a(n-2) + a(n-3), with a(0) = 3, a(1) = 2, a(2) = 6.at n=32A046877
• a(n) = 3^n+2*2^n-3.at n=9A072674
• Square root of n has the same nonzero digit in each of the first 4 places to the right of the decimal point.at n=8A073585
• Number of different values obtained by evaluating all different parenthesizations of 1/2/3/4/.../n.at n=18A078389
• a(n) = 81*n^2 - 2*n.at n=15A157507
• Triangle read by rows: T(n,k) is the number of permutations of [n] that have k isolated entries (0 <= k <= n).at n=58A180196
• Number of n X 2 nonnegative integer arrays with upper left 0 and every value within 3 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.at n=21A252932
• 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 393", based on the 5-celled von Neumann neighborhood.at n=21A281742
• a(n)^2 is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).at n=41A340664
• Number of positive integers with n digits that are equal both to the product of two integers ending with 4 and to that of two integers ending with 6.at n=5A347748