42243

Appears in sequences

• a(n) = 9^n - 7^n + 1.at n=5A155660
• Number of ordered 9-tuples of distinct pairwise coprime positive integers with largest element n.at n=22A186980
• Number of 8-element subsets of {1, 2, ..., n} having pairwise coprime elements.at n=23A186984
• Constant term of the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=15A193008
• Semiprimes whose reversal + 1 is a square.at n=28A245362
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + 2*b(n-2), where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=17A294418
• Number of series-reduced rooted trees whose leaves are strict integer partitions whose multiset union is a strict integer partition of n.at n=23A320176