72960

Appears in sequences

• Expansion of (1+2*x) / (1-2*x)^4.at n=8A014483
• Number of strongly triple-free subsets of {1, 2, ..., n}.at n=21A050295
• Engel expansion of log(1/gamma) (where gamma is the Euler-Mascheroni constant A001620) = 0.549539...at n=10A059192
• Sums of the squares of the elements in the subsets of the integers 1 to n.at n=9A087076
• The first integer in the sequence defined by b(0)=(2n+1)/n and b(k+1)=b(k)*floor(b(k)) for k>=0.at n=8A087670
• Number of rooted planar 4-constellations with n quadrangles: rooted planar maps with bicolored faces having n black quadrangular faces and an arbitrary number of white faces of degrees multiple to 4.at n=4A090374
• a(n) = binomial(n+2,3)*4^3.at n=17A141478
• Triangle of f-vectors of the simplicial complexes dual to the permutohedra of type B_n.at n=24A145901
• Number of nonoverlapping placements of one 1 X 1 square and one 2 X 2 square on an n X n board.at n=16A173963
• a(n) = 81*n^2 + 2*n.at n=29A177099
• The number of bijections f:{1,...,n}->Z/nZ such that f(ab)=f(a)+f(b) whenever all three function values are defined.at n=24A179989
• Logarithms (cf. A179989) f:{1,...,n}->Z/nZ such that either (i) n is odd or (ii) n is even and f(m) is even whenever m divides n/2.at n=24A179990
• Triangle read by rows, T(n,k) for 0<=k<=n, generalizes the colored Motzkin paths of A129400.at n=48A201641
• 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 157", based on the 5-celled von Neumann neighborhood.at n=16A279471
• Smallest number that is the sum of n successive primes and also the sum of n successive semiprimes, n > 1.at n=22A283873
• Numbers k such that sigma(sigma(k^4)) == 0 (mod k^2).at n=30A320425
• a(n) = (1/3)*A374654(n).at n=6A374655