18186

Appears in sequences

• exp(arctanh(x)*exp(x))=1+x+3/2!*x^2+12/3!*x^3+57/4!*x^4+340/5!*x^5...at n=7A012709
• Number of partitions of n into parts not of the form 25k, 25k+2 or 25k-2. Also number of partitions with 1 part of size 1 and differences between parts at distance 11 are greater than 1.at n=42A036001
• Denominators of convergents to Pi by Farey fractions.at n=28A063673
• Symmetric triangle, read by rows, where row n equals the (n+1)-th differences of the crystal ball sequence for D_n lattice, for n>=0.at n=48A108558
• Symmetric triangle, read by rows, where row n equals the (n+1)-th differences of the crystal ball sequence for D_n lattice, for n>=0.at n=51A108558
• Number of distinct squares D(n) in the n-th iterate of the tribonacci morphism (a -> ab, b -> ac, c -> a) on the letter a.at n=13A116576
• Number of involutions of length 2n+1 which are invariant under the reverse-complement map and have no decreasing subsequences of length 7.at n=8A145868
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.at n=8A149472
• Values of n such that n^a-+a are primes, a=5.at n=21A155021
• Triangle interpolating the swinging factorial (A056040) restricted to odd indices with its binomial transform. Same as interpolating the beta numbers 1/beta(n,n) (A002457) with (A163869). Triangle read by rows, for n >= 0, k >= 0.at n=25A163842
• Numbers that match polynomials over {0,1} that have a factor containing -3 as a coefficient; see Comments.at n=24A208182
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 14", based on the 5-celled von Neumann neighborhood.at n=39A269709
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 406", based on the 5-celled von Neumann neighborhood.at n=38A271772
• Numbers n such that Bernoulli number B_{n} has denominator 1806.at n=25A272139
• Number T(n,k) of linear chord diagrams having n chords and maximal chord length k (or k=0 if n=0); triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=40A293961
• Number of linear chord diagrams having 2n chords and maximal chord length n, a(0)=1.at n=4A293963