21632

Appears in sequences

• Expansion of e.g.f. exp(x + tan(x)).at n=8A009284
• 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 73.at n=34A031571
• Sum of the lengths of the cycle types of the permutation created by length sorting on the partitions of n.at n=36A036056
• Expansion of 1/(1 - 2*x^2 - 2*x^3).at n=19A052907
• Low-temperature specific heat expansion for square lattice (Potts model, q=3).at n=9A057376
• a(n) is the number of 2 X 1 domino tilings of the set S in the plane R^2 consisting of the union of the following two rectangles: rectangle1: |x| <= n, |y| <= 1, rectangle2: |x| <= 1, |y| <= n.at n=5A060635
• Numbers k such that (6^k)*(2^k - 1) + 1 is prime.at n=12A098864
• Numbers n such that n + (sum of prime factors of n) = next prime after n.at n=30A105779
• Numbers of the form (2^i)*(13^j).at n=37A107326
• Numbers k such that previous_prime(k)=k-sd and next_prime(k)=k+sd where sd is sum of the distinct prime factors of k.at n=6A125841
• Number of intersections of at least four edges in a cube of n X n X n smaller cubes.at n=26A126562
• Number of trisubstituted linear alkanes of composition C_n H_(2n-1) XYZ.at n=17A159941
• Numbers with prime signature {7,2}, i.e., of form p^7*q^2 with p and q distinct primes.at n=5A179689
• (A192533)/2.at n=37A192534
• Number of (n+2)X4 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=3A203917
• Number of (n+2)X6 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=1A203919
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=11A203923
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=13A203923
• Number of n X 2 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than one of its immediate leftward or upward or left-upward diagonal neighbors.at n=5A208561
• Number of nX6 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than one of its immediate leftward or upward or left-upward diagonal neighbors.at n=1A208565