57553

Appears in sequences

• Strong pseudoprimes to base 66.at n=22A020292
• Strong pseudoprimes to base 88.at n=22A020314
• Number of quasi-triominoes in an n X n bounding box.at n=24A094170
• Triangle T(n, k, q) = binomial(n, k) + q^n*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 2, read by rows.at n=59A173046
• Triangle T(n, k, q) = binomial(n, k) + q^n*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 2, read by rows.at n=61A173046
• Number of rooted trees with n nodes having some subtrees replaced by cycles such that no leaf nodes are left over.at n=22A213682
• Number of length 5+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.at n=15A248542
• Expansion of Sum_{k>=0} k! * x^(k*(k+1)/2) / Product_{j=1..k} (1 - x^j)^j.at n=24A306665
• Numbers k such that A(k+1) = A(k) + 3, where A() = A005100() are the deficient numbers.at n=16A317046
• Number of colored integer partitions of n such that four colors are used and parts differ by size or by color.at n=16A327382