51300

Appears in sequences

• a(n) is the number of c-nets with n+1 vertices and 2n+2 edges, n >= 1.at n=7A001508
• a(n) = (2*n - 3)n^2.at n=30A015238
• Numerator of n*(n-2)*(2*n-1)/(2*(n-1)).at n=36A022997
• McKay-Thompson series of class 13A for the Monster group with a(0) = -2.at n=17A034318
• McKay-Thompson series of class 13A for the Monster group with a(0) = 0.at n=17A034319
• a(n) = 18*(n - 2)*(2*n - 5).at n=38A060787
• First differences of A069473.at n=6A069474
• a(n) = least k such that the average number of divisors of {1..k} is >= n.at n=10A085829
• Number of A095284-primes in range ]2^n,2^(n+1)].at n=21A095294
• Number of A095312-primes in range ]2^n,2^(n+1)].at n=21A095332
• Number of 4-step one space for components leftwards or up, two space for components rightwards or down asymmetric quasi-bishop's tours (antidiagonal moves become knight moves) on an n X n board summed over all starting positions.at n=33A187608
• Numbers with prime factorization p*q^2*r^2*s^3 (where p, q, r, s are distinct primes).at n=18A190109
• Molecular topological indices of the crown graphs.at n=18A192796
• Triangle read by rows: T(n,k) is the number of c-nets with n+1 faces and k+1 vertices, 1 <= k <= n. But see A290326 for a better version.at n=52A210252
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 253", based on the 5-celled von Neumann neighborhood.at n=41A271052
• Triangle read by rows: T(n,k) is the number of c-nets with n+1 faces and k+1 vertices.at n=47A290326
• Triangle read by rows: T(n,k) is the number of c-nets with n+1 faces and k+1 vertices.at n=73A290326
• Numbers x such that sigma(x) = sigma(y), with x<>y, where y is the 10's complement mod 10 of the digits of x.at n=21A300447
• a(n) = n! * [x^n] exp(n*x)*arcsin(x).at n=6A302605
• Triangle read by rows: T(n,k) is the number of digraphs on n labeled nodes with k arcs and a global source (or sink), n >= 1, k = 0..(n-1)^2.at n=27A350793