43428

Appears in sequences

• Number of nonisomorphic commutative groupoids with no symmetry.at n=4A030255
• a(n) is the number of distinct (modulo geometric D3-operations) nonsymmetric (no reflective nor rotational symmetry) patterns which can be formed by an equilateral triangular arrangement of closely packed black and white cells satisfying the local matching rule of Pascal's triangle modulo 2, where n is the number of cells in each edge of the arrangement. The matching rule is such that any elementary top-down triangle of three neighboring cells in the arrangement contains either one or three white cells.at n=17A060552
• Number of isomorphism classes of commutative closed binary operations (groupoids) on a set of order n, listed by class size.at n=14A079185
• a(n) = floor(Fibonacci(n)/n).at n=30A127884
• Sequence t_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).at n=13A129875
• Numbers n such that n^6 + 545 is prime.at n=31A163592
• Fibonacci-Legendre quotients: (Fibonacci(p) - L(p/5)) / p, where p = prime(n) and L(p/5) is the Legendre symbol.at n=10A222361
• Number of partitions p of n such that max(p) - 2*min(p) is a part of p.at n=49A238626
• a(n) = gcd(Sum_{k=1...n} F(k), Product{j=1...n} F(j)), where F(k) is the k-th Fibonacci number.at n=28A239740