18975

Appears in sequences

• Coefficient of x^4 in (1-x-x^2)^(-n).at n=21A006504
• a(n) = floor(n*(n-1)*(n-2)*(n-3)/16).at n=25A011926
• Number of partitions of n into parts of 22 kinds.at n=4A023020
• Numbers n such that n^2 can be split into two nonzero squares (perhaps with leading zeros) in exactly two different ways.at n=7A054737
• Sum of primes p with n^2 < p < (n+1)^2.at n=40A108314
• a(n)=3!*n!/(8!*19!).at n=1A157983
• Totally multiplicative sequence with a(p) = 8p-1 for prime p.at n=41A166657
• Number of zero-sum -n..n arrays of 4 elements with first and second differences also in -n..n.at n=25A201875
• a(n) = floor(M(g(n-1)+1,..,g(n))), where M = harmonic mean and g(n) = n*(n + 1)*(n + 2)*(n + 3)/24.at n=24A227018
• Number of nonnegative integers with property that their base 5/3 expansion (see A024633) has n digits.at n=17A245418
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 846", based on the 5-celled von Neumann neighborhood.at n=43A290554
• Number of rooted twice-partitions of n where the composite rooted partition is constant.at n=36A301760
• Square array read by antidiagonals upwards: T(i,j) is the smallest number m such that the symmetric representation of sigma, SRS(m), has maximum width 3, consists of i parts and has 2*j occurrences of maximum width 3 in its width pattern (row m of A341969).at n=31A377667