26304

Appears in sequences

• Number of non-degenerate fanout-free Boolean functions of n variables using And, Or, Not and Majority gates.at n=5A005615
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 81.at n=30A031579
• Nonisomorphic catacondensed monoheptafusenes (see reference for precise definition).at n=9A044046
• Numbers k such that the sum of the first k composite numbers is palindromic.at n=12A053779
• Smallest possible sum of n positive integers g(1) < g(2) < ... < g(n) such that A001222(g(i)+g(j)) = A001222(g(i)) + A001222(g(j)) for all 1<=i<j<=n.at n=10A059393
• a(n) = n for n <= 2; for n > 2, a(n) = 2a(n-1) - a(n - floor(1/2 + sqrt(2(n-1)))).at n=19A096824
• Symmetric triangle, read by rows of 2*n+1 terms, similar to triangle A008301. Second term 4 times first term.at n=19A126150
• Symmetric triangle, read by rows of 2*n+1 terms, similar to triangle A008301. Second term 4 times first term.at n=21A126150
• Secondary diagonal of symmetric triangle A126150: a(n) = A126150(n+1,n).at n=3A126153
• Number of arrangements of 3 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero.at n=25A189546
• a(n) is the optimal wire-length for an n X n grid.at n=30A195647
• Numbers k such that k!*2^k + 1 is prime.at n=5A256594
• a(n) = sigma(n)*pi(n^2), where sigma(n) is the sum of all (positive) divisors of n, and pi(x) is the number of primes not exceeding x.at n=41A263325
• T(n,k)=Number of nXk arrays of permutations of 0..n*k-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.at n=17A264704
• Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.at n=3A264706
• Growth series for affine Coxeter group B_4.at n=35A267167
• G.f. A(x) satisfies A(x) = (1 + x)^2 * B(x*A(x)), where B(x) is the g.f. of A001764.at n=6A381938
• a(n) = (1/2) * Sum_{k=0..n} 2^k * binomial(2*k+2,2*n-2*k+1).at n=7A387550