18406

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 72 ones.at n=32A031840
• a(1) = 1; a(n+1) = a(1) + a(2)*(a(2) + a(3)*(a(3) +...+a(n-1)*(a(n-1) + a(n))...)).at n=6A061291
• Convolution of primes with partition numbers.at n=18A086717
• Numbers k such that numerator(Bernoulli(2*k)/(2*k)) is different from numerator(Bernoulli(2*k)/(2*k*(2*k-1))).at n=70A090495
• O.g.f. satisfies A(x/(1-x)) = 1/(1-x*A(x)-x^2*A(x)^2).at n=14A184936
• Number of 0..1 arrays x(0..n-1) of n elements with each no smaller than the sum of its four previous neighbors modulo 2.at n=25A200462
• Number of (n+1) X 2 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=7A204609
• T(n,k) = Number of (n+1) X (k+1) 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=28A204616
• T(n,k) = Number of (n+1) X (k+1) 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=35A204616
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing.at n=28A204800
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing.at n=35A204800
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.at n=28A253231
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.at n=35A253231
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=28A253350
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=35A253350
• Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change 1,1 2,2 -1,0 or 0,-1.at n=9A264650
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 969", based on the 5-celled von Neumann neighborhood.at n=23A273849