1966080

Appears in sequences

• a(n) = n*(n+1)*2^(n-2).at n=15A001788
• Number of primitive polynomials of degree n over GF(9).at n=8A027745
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*10^j.at n=22A038288
• Triangle whose (i,j)-th entry is binomial(i,j)*10^(i-j)*8^j.at n=26A038310
• 4-fold convolution of A000302 (powers of 4); expansion of g.f. 1/(1-4*x)^4.at n=7A038846
• Triangle T(n,k) of number of minimal 3-covers of a labeled n-set that cover k points of that set uniquely (k=3,..,n).at n=28A057964
• Maximal number of divisors of any n-digit number.at n=24A066150
• Numbers whose product of distinct prime factors is equal to its sum of digits.at n=27A067077
• 19-almost primes (generalization of semiprimes).at n=6A069280
• Numbers of the form 5*2^n or 5*3*2^n; a(n) = 5*A029744(n).at n=36A070004
• Binary expansion is 1xx100...0 where xx = 00 or 11.at n=35A070876
• 1/2 times the number of n X n 0..3 matrices M with MM' mod 4 = I, where M' is the transpose of M and I is the n X n identity matrix.at n=4A071303
• Let P(n,X) = Product_{i=1..2n+1} (X - 1/cos(Pi*k/(2n+1))); then P(n,X) is a polynomial with integer coefficients. Sequences gives maximum values of absolute values of coefficients of P(n,X).at n=9A075581
• Expansion of (1 - 2x + 2x^2 - x^3)/(1 - 2x)^2.at n=18A084860
• Number of subsets of {1,.., n} containing at least one square.at n=20A089888
• a(n) = ((3*n)!/n!^2)*(Gamma(1+n/2)/Gamma(1+3n/2)).at n=7A091527
• Number of divisors of the n-th superior highly composite number.at n=27A098895
• Smallest number beginning with the digits of n that has exactly n prime factors (counted with multiplicity).at n=18A109686
• a(n) = 15*2^n.at n=17A110286
• Numbers n such that sigma(uphi(n)) = n where uphi is the unitary totient (or unitary phi) function (see A047994).at n=32A120116