28777

Appears in sequences

• Number of maximal collections of pairwise disjoint subsets {X,Y,Z} of {1, 2, ..., n}, each satisfying X + Y = Z.at n=24A002849
• a(n) = least k such that the remainder when 27^k is divided by k is n.at n=33A128367
• Number of binary strings of length n with no substrings equal to 0001 0011 or 1110.at n=18A164461
• Number of nondecreasing strings of numbers x(i=1..7) in -n..n with sum x(i)^3 equal to 0.at n=31A188281
• T(n, k) = Sum_{j=0..k} binomial(n, k - j)*Stirling1(n - k + j, j)*(-1)^(n-k). Triangle read by rows, T(n, k) for 0 <= k <= n.at n=40A341101