103680

Appears in sequences

• Associated Mersenne numbers.at n=24A001350
• Alternate Lucas numbers - 2.at n=12A004146
• Triangle of coefficients in expansion of (1+12x)^n.at n=19A013619
• Expansion of (1+x^2)/(1-2*x+x^3).at n=22A014739
• Numbers n such that uphi(sigma(n)) = n, where the uphi is the unitary phi function A047994.at n=26A030164
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*1^j.at n=16A038327
• E.g.f.: (1-x)^2/(1-3*x+x^2).at n=6A052567
• Expansion of e.g.f. 1/2-1/2*(1-4*x-4*x^2)^(1/2).at n=6A052727
• E.g.f. (1-sqrt(1-4x-4x^2))/2 -x*(1+x).at n=6A052739
• Saint-Exupéry numbers: ordered products of the three sides of Pythagorean triangles.at n=29A057096
• Products of distinct factorials.at n=25A058295
• Shifts left when MASKCONVolved with itself.at n=13A062177
• Cyclotomic polynomials Phi_n at x=phi, floored down (where phi = tau = (sqrt(5)+1)/2).at n=23A063703
• Cyclotomic polynomials Phi_n at x=phi, rounded to nearest integer (where phi = tau = (sqrt(5)+1)/2).at n=23A063705
• Triangle T(n,k), n >= 2, n+1 <= k <= 2*n-1, number of permutations p of 1,...,n, with max(p(i)+p(i-1), i=2..n) = k.at n=33A064484
• Maximal number of divisors of any n-digit number.at n=17A066150
• Smallest integer that can be expressed as the sum of consecutive odd numbers in exactly n ways.at n=34A068314
• 13-almost primes (generalization of semiprimes).at n=27A069274
• Coefficient triangle of polynomials (falling powers) related to convolutions of A002605(n), n>=0, (generalized (2,2)-Fibonacci). Companion triangle is A073404.at n=15A073403
• Coefficient triangle of polynomials (rising powers) related to convolutions of A002605(n), n >= 0, (generalized (2,2)-Fibonacci). Companion triangle is A073406.at n=20A073405