27489

Appears in sequences

• a(n) = (n+1)*(2*n+1)*(3*n+1).at n=16A011199
• a(n) = 49*(n-1)*(n-2)/2.at n=32A027469
• Numbers with exactly one arithmetic progression of four successive divisors (not necessarily consecutive).at n=22A094530
• Expansion of x/(1 -x^2 -x^4 -x^7 -x^8 -x^9 -x^10).at n=34A143351
• a(n) = binomial(n+1,2)*7^2.at n=33A162942
• Dihedral unlabeled Motzkin numbers: number of ways of drawing any number of nonintersecting chords joining n unlabeled points equally spaced on a circle, up to rotations and reflections of the circle.at n=16A185100
• Triangle T(n,k) represents the coefficients of (x^17*d/dx)^n, where n=1,2,3,...at n=6A223519
• Number of 4 X n 0..2 arrays with no element equal to the sum of elements to its left or one plus the sum of the elements above it, modulo 3.at n=23A239031
• Numbers with five neighboring primes on the hexagonal spiral board of odd numbers.at n=24A345654