28646

Appears in sequences

• Number of binary vectors of length n+1 beginning with 0 and containing just 1 singleton.at n=20A006367
• Number of distinct coefficients in expansion related to enumeration of permutations of length n by length of longest subsequence.at n=21A068604
• Semiprimes in A054552.at n=30A113690
• a(1)=2. For n >=2, a(n) = the least integer >= a(n-1) that is not coprime to both a(n-1)+1 and a(n-1).at n=30A140525
• Table which contains in row n the mapping of the n-th block of 4 primes to 4 integers.at n=29A162156
• Numbers k such that Sum_{i=1..k} i^6 divides Product_{i=1..k} i^6.at n=33A166606
• Number of (w,x,y,z) with all terms in {0,...,n} and |w-x|+|x-y+|y-z|=n.at n=31A212904
• a(0) = a(1) = 1; for n>1, a(n) = a(n-1) + a(n-2) + floor(n/2).at n=20A215004
• a(0)=0, a(n+1) is the least k>a(n) such that k+a(n)+n+1 is a Fibonacci number.at n=21A215006
• Number of strict partitions of 2n that include a partition of n.at n=37A237258
• a(n) = Fibonacci(2n + 1) - n.at n=10A280523
• The number of edges inside a cross with width 3 and height n (see Comments in A331455 for definition) formed by the straight line segments mutually connecting all vertices and all points.at n=15A330851