9437184

Appears in sequences

• a(n) = 9*4^n.at n=10A002063
• a(n) = 9*2^n.at n=20A005010
• Number of compositions of n into 3*j-1 kinds of j's for all j >= 1.at n=12A055841
• a(n) = n*2^n - 2^n = 2^n*(n-1).at n=18A058922
• Reciprocal of n terminates with an infinite repetition of digit 7. Multiples of 10 are omitted.at n=4A064566
• Product of nonzero digits of A066555(n).at n=22A066585
• Eighth column of triangle A067410.at n=6A067415
• Smallest integer that can be expressed as the sum of consecutive odd numbers in exactly n ways.at n=28A068314
• Triangular array T(n,k) read by rows, giving number of labeled free trees such that the root is smaller than all its children, with respect to the number n of vertices and to the degree k of the root.at n=28A071210
• Let P(k,X) = 4^k*Product_{i=1..k} (X - cos(Pi*i/k)) (which is a polynomial with integer coefficients). Sequence gives maximum absolute values of coefficients of P(n,X).at n=10A075614
• a(1)=1, then a(n)=3*a(n-1) if n is already in the sequence, a(n)=2*a(n-1) otherwise.at n=22A079352
• a(i) = the number of occurrences of 9's in the palindromic compositions of n=2*i-1 = the number of occurrences of 10's in the palindromic compositions of n=2*i.at n=18A079862
• Expansion of g.f. (1 + 6*x + 5*x^2)/((1-2*x)*(1+2*x)).at n=22A084431
• Expansion of (1-3x+4x^2-3x^3+x^4)/(1-2x)^2.at n=21A084861
• Triangle, read by rows, of coefficients of the hyperbinomial transform.at n=47A088956
• Number of subsets of {1,.., n} containing exactly two primes.at n=26A089822
• a(n) = the least number which is the average of two consecutive primes and has exactly n prime factors (counted with multiplicity).at n=20A092576
• Smallest number beginning with 9 and having exactly n prime divisors counted with multiplicity.at n=21A106429
• a(n) is the number of divisors of the concatenation of 2178 with itself n times.at n=20A110753
• a(n) = Tau(N), where N = the number obtained as a concatenation of 9801 with itself n times. Tau(n) = number of divisors of n.at n=23A110755