24138

Appears in sequences

• Number of modes of connections of 2n points.at n=8A006605
• Decimal part of cube root of n starts with 9: first term of runs.at n=27A034135
• Triangular array generated by its row sums: T(n,0) = 1 for n >= 0, T(n,1) = r(n-1), T(n,k) = T(n,k-1) - (-1)^k * r(n-k) for k = 2, 3, ..., n, n >= 2, r(h) = sum of the numbers in row h of T.at n=48A054090
• T(n,3), array T as in A054090.at n=6A054097
• McKay-Thompson series of class 19A for Monster.at n=23A058549
• McKay-Thompson series of class 19A for the Monster group with a(0) = 3.at n=23A136569
• G.f. satisfies: A(x) = 1 + x*A(x)*A(-x) + x^2*A(x)^2*A(-x)^2.at n=17A143926
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 0, 1), (0, 1, 0), (1, 0, 0)}.at n=9A149912
• Array of coefficients A(n,k) of the formal power series P(n,x) read by upwards antidiagonals, where P(n,x) = Sum_{k>=0} A(n,k)*x^k = 1+x*P(n,x)^(1*n)+x^2*P(n,x)^(2*n) for n >= 0.at n=63A261440
• Sum of the cubes of the parts in the partitions of n into two parts.at n=17A294270
• Number of n X 3 0..1 arrays with every element equal to 1, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.at n=10A299523
• Number of length-n ternary words containing no even palindromes of length > 0 and no odd palindromes of length > 3.at n=22A330132
• Primitive practical numbers of the form 2 * 3^i * prime(k).at n=32A367481
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,0) = 0^n and T(n,k) = k * Sum_{r=0..n} binomial(2*n+k,r) * binomial(r,n-r)/(2*n+k) for k > 0.at n=53A378292
• Numbers k such that the powerful part of the sum of divisors of k (A387726) is greater than or equal to k, and sigma(k) is not itself a powerful number.at n=21A387729