29680

Appears in sequences

• Number of 3-line Latin rectangles.at n=5A001626
• "DHK[ 8 ]" (bracelet, identity, unlabeled, 8 parts) transform of 1,1,1,1,...at n=15A032249
• The n-th n-gonal number: a(n) = n*(n^2 - 3*n + 4)/2.at n=40A060354
• Sums of members of groups in A076063.at n=38A076066
• n*(n-1)*(n^2-n+4)/6.at n=21A103290
• Numbers k such that the k-th triangular number contains only digits {0,4,6}.at n=8A119074
• Number of excedances in all odd permutations of {1,2,...,n} with no fixed points.at n=7A145886
• Partial sums of A068148.at n=30A178137
• Expansion of -2*x^2*(-3-2*x+x^2-x^3-2*x^4+x^5) / ( (1+x)^2*(x-1)^4 ).at n=39A178465
• Number of nX4 0..1 arrays with row sums equal and column sums unequal to adjacent columns.at n=5A202738
• T(n,k)=Number of nXk 0..1 arrays with row sums equal and column sums unequal to adjacent columns.at n=41A202742
• Number of 6Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns.at n=3A202747
• Expansion of (1 + 2*x + 2*x^2) / (1 - x)^6.at n=13A244882
• Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to the sum of two pentagonal numbers P(m) and P(m+1) for some m.at n=3A251730
• 40-gonal numbers: a(n) = 38*n*(n-1)/2 + n.at n=40A261191
• a(n) = n*(n + 1)*(n + 2)*(4*n - 3)/6.at n=14A264851
• Number of symmetric subsets of {1,..,2n} for which the reciprocal of the modular-part product is also a modular-part product.at n=13A329778
• a(n) = Sum_{1 <= i, j <= n} gcd(i, j, n)^3.at n=23A368743