18048

Appears in sequences

• Theta series of laminated lattice LAMBDA_11^{min}.at n=5A006910
• tan(arcsin(x)*arcsin(x))=2/2!*x^2+8/4!*x^4+368/6!*x^6+18048/8!*x^8...at n=4A012342
• arctanh(arcsin(x)*arcsin(x))=2/2!*x^2+8/4!*x^4+368/6!*x^6+18048/8!*x^8...at n=4A012348
• Expansion of (theta_3(z)*theta_3(2z)*theta_3(4z)+theta_2(z)*theta_2(2z)*theta_2(4z))^4.at n=30A028701
• 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 67.at n=29A031565
• Numbers of nonisomorphic systems of catafusenes (see Cyvin et al. (1994) for precise definition).at n=8A045906
• Numbers k > 1 such that, in base 8, k and k^2 contain the same digits in the same proportion.at n=22A061662
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,7.at n=16A064240
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,21.at n=23A064247
• a(n) = 2*a(n-1) + 10*a(n-2), with a(0) = 1, a(1) = 2.at n=7A083102
• a(n) = floor(C(n+6,6)/C(n+2,2)).at n=46A084626
• Poincaré series [or Poincare series] P(T_{3,2}; x).at n=13A124615
• 6 times octagonal numbers: a(n) = 6*n*(3*n-2).at n=32A153796
• Number of 2n-digit primes that are concatenation of n two-digit distinct primes p_1...p_n, 98>p_1>p_2>...>p_n>10.at n=10A168513
• Numbers with prime signature {7,1,1}, i.e., of form p^7*q*r with p, q and r distinct primes.at n=22A179696
• Number n such that Fibonacci(n) is divisible by n, n + 1 and n - 1.at n=6A221018
• Number of (n+1)X(2+1) 0..4 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 10.at n=2A234077
• Number of (n+1)X(3+1) 0..4 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 10.at n=1A234078
• T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 10 (10 maximizes T(1,1)).at n=7A234083
• T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 10 (10 maximizes T(1,1)).at n=8A234083