218400

Appears in sequences

• Stirling numbers of first kind, s(n+3, n), negated.at n=12A001303
• Number of nonseparable rooted toroidal maps with n + 3 edges and n + 1 vertices.at n=12A006408
• G.f.: (1+x^2+x^3)/(1-x-x^2-x^4-x^5).at n=21A188223
• Triangle read by rows: T(n,k) is the number of compositions of set {1, 2, ..., k} into exactly n blocks, each of size 1, 2 or 3 (n >= 0, 0 <= k <= 3*n).at n=32A189804
• Numbers k such that k and k^3 are sums of two twin primes.at n=31A213811
• Triangle S(n,k) by rows: coefficients of 3^((n-1)/2)*(x^(1/3)*d/dx)^n when n is odd, and of 3^(n/2)*(x^(2/3)*d/dx)^n when n is even.at n=36A223169
• Numbers k such that core(k) is equal to the sum of the proper square divisors of k, where core(k) = A007913(k).at n=14A225882
• Triangle read by rows: T(m,n) = number of ways of distributing n distinguishable balls into m distinguishable bins of size 3 where empty bins are permitted (m >= 1, 1 <= n <= 3m).at n=27A248845
• Number of 2 X 2 matrices with entries in {0,1,...,n} and odd trace with no elements repeated.at n=26A279905
• Numbers n having a proper divisor d such that sigma(n) - k*d = k*n. Case k = 4.at n=19A291458
• Primitive 4-abundant numbers: Numbers k such that sigma(k) > 4k (A068404) all of whose proper divisors d are 4-deficient numbers (having sigma(d) < 4d).at n=17A307114
• Triangle read by rows, T(n, k) (0 <= k <= n) = (-m)^(n-k)*[x^k] KummerU(-n, 1/m, x) for m = 3.at n=23A331331
• El Gradechi's hybrid coefficients alpha^{4,4}_{2n}.at n=6A331768
• Irregular triangle read by rows: T(n,k) is the number of permutations of an n X n Rubik's Square reachable in k or fewer moves, terminating at the maximum value.at n=28A335136
• Numbers m such that the smallest digit in the decimal expansion of 1/m is 4, ignoring leading and trailing 0's.at n=34A352158
• a(n) is the smallest number k with exactly n of its divisors in A037197.at n=22A362139
• a(n) = n^2*sigma_2(n).at n=20A386745
• Primitive terms of A023198: numbers k with the property sigma(k)/k >= 4 that are not divisible by any other number with that property.at n=19A392936