44550

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-1)/3.at n=38A048015
• Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-2)/3.at n=38A048026
• Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-3)/3.at n=38A048037
• a(n) = n*(2*n+1)^2.at n=22A084367
• a(1) = a(2) = 0; a(3) = 2; for n >= 4, a(n) = (prime(n-1)-2)*a(n-1), where prime(n) is the n-th prime.at n=7A121406
• Number of (n+2) X 5 binary arrays avoiding patterns 001 and 101 in rows and columns.at n=6A202197
• Number of (n+2) X 9 binary arrays avoiding patterns 001 and 101 in rows and columns.at n=2A202201
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 001 and 101 in rows and columns.at n=38A202202
• a(n) = (n^2 + 2*(Sum_{j = 1..n} j^n)) (mod n^3).at n=44A219540
• Triangular array: For n >= 2 and 0 <= k <= n - 2, T(n, k) equals the number of rooted duplication trees on n gene segments whose leftmost visible duplication event is (k, r), for 1 <= r <= (n - k)/2.at n=51A264869
• a(n) = n^2 * floor(n/2).at n=45A265645
• Twice the median of {Stirling2(n, k), k = 0..n}.at n=11A327559
• Expansion of x^2*(10-5*x+x^2)/((1-x)^4*(1-x^2)).at n=23A331429
• Integers k such that k/A097621(k) is an integer.at n=25A344826
• Numbers k such that k and k+1 are both products of 2 triangular numbers.at n=19A356748
• The number of positive n-digit integers whose digit product is n.at n=44A373641
• Sum of squares of the multiplicities of pairwise distances among the vertices of a regular n-gon.at n=42A387858