21532

Appears in sequences

• Related to Fibonacci numbers.at n=7A006502
• Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly n ways.at n=6A076459
• Numbers m such that m^2 + 3^k is prime for k = 1, 2, 3.at n=30A177173
• Number of 5-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=19A187379
• Triangle T(n,k) (0 <= k <= n) giving coefficients of certain polynomials related to Fibonacci numbers.at n=48A259708
• Triangle T(n,k) (0 <= k <= n) giving coefficients of certain polynomials related to Fibonacci numbers.at n=52A259708
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 481", based on the 5-celled von Neumann neighborhood.at n=30A272457
• Number of nX5 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.at n=10A281466
• Irregular triangle read by rows: centered moments of the random Laplacian spectral distribution.at n=18A294441
• Numbers k whose binary expansion contains 2 adjacent 1's and A391571(k) = k.at n=44A391581