61446

Appears in sequences

• Central factorial numbers: A008955(n,2).at n=8A000596
• Number of 3-rowed binary matrices with n ones and no zero columns, up to row and column permutation.at n=37A058053
• a(n) = ceiling(a(n-1)*3/2) with a(1) = 1.at n=26A061419
• Number of numbers whose base-3/2 expansion (see A024629) has n digits.at n=26A081848
• a(1) = 1; for n > 1: if n is even, a(n) = least k > 0 such that sum(i=1,n/2,a(2*i-1))/sum(j=1,n,a(j))>=1/4, or 1 if there is no such k; if n is odd, a(n) = largest k > 0 such that sum(i=1,(n+1)/2,a(2*i-1))/sum(j=1,n,a(j))<=1/3, or 1 if there is no such k.at n=55A104740
• Kekulé numbers for certain benzenoids.at n=5A110693
• Numbers of length n binary words with fewer than 6 0-digits between any pair of consecutive 1-digits.at n=16A145114
• Values of register b when register a becomes 0 for the two register machine {i[1], i[1], i[1], d[2,1], d[1,6], i[2], d[1,5], d[2,3]}.at n=26A156623
• Let x(1)x(2)...x(q) the decimal expansion of the numbers k having exactly q distinct prime divisors p(1) < p(2) < ... < p(q). Sequence lists the numbers k such that p(1)/x(1) + p(2)/x(2) + ... + p(q)/x(q) is an integer.at n=20A235152
• Let x(1)x(2)...x(q) the decimal expansion of the numbers k having exactly q distinct prime divisors p(1) < p(2) < ... < p(q). Sequence lists the numbers k such that p(1)/x(q) + p(2)/x(q-1)+ ... + p(q)/x(1) is an integer.at n=30A235153