18025

Appears in sequences

• Expansion of e.g.f. cos(sinh(x)*exp(x)).at n=8A009061
• Expansion of 1/((1-2x)(1-3x)(1-6x)(1-7x)).at n=4A025937
• Denominators of continued fraction convergents to sqrt(499).at n=7A041953
• Numbers n such that n^2 can be split into two nonzero squares (perhaps with leading zeros) in exactly two different ways.at n=6A054737
• Number of base 25 circular n-digit numbers with adjacent digits differing by 5 or less.at n=4A125388
• 5 times octagonal numbers: a(n) = 5*n*(3*n-2).at n=35A153795
• Positions of zeros in A165597.at n=33A165598
• Number of (w,x,y,z) with all terms in {0,...,n} and at least one of these conditions holds: w=R, x=R, y=R, z<R, where R = max{w,x,y,z} - min{w,x,y,z}.at n=12A212751
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 278", based on the 5-celled von Neumann neighborhood.at n=38A271097
• a(n) is the number of free polyominoes of width 3 and size n.at n=10A353067
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = (-1)^n * Sum_{j=0..n} (-k*j)^j * binomial(n,j).at n=32A362019
• Number of integer partitions of n having a unique mode.at n=37A362608
• Expansion of e.g.f. exp(-x) / (1 + LambertW(-3*x)).at n=4A362860
• a(n) = Sum_{k=2..n} binomial(k,2) * floor(n/k).at n=44A366967
• Irregular triangle read by rows: T(n,k) is the number of free polyominoes with n cells and width k, n >= 1, 1 <= k <= ceiling(n/2).at n=44A379623