41409

Appears in sequences

• Number of difference sets of subsets of {1,2,...,n}, i.e., the size of {D(A) : A subset [n] }, where D(A)={a_i-a_j : a_i>a_j and a_i,a_j in A}.at n=22A067247
• Numbers k such that 10^999 + k is a (titanic) prime.at n=22A074282
• Heptagonal numbers for which the sum of the digits is also a heptagonal number.at n=32A117650
• Indices where A092243 strictly changes sign.at n=11A269737
• Number of maximum matchings in the n X n rook complement graph.at n=3A292198
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + 2, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=18A293765