51885

Appears in sequences

• Number of 4-tuples (w,x,y,z) with all terms in {1,...,n} and w*x >= 2*y*z.at n=20A211809
• Number of (n+1) X 3 0..2 matrices with each 2 X 2 subblock idempotent.at n=16A224670
• Number of compositions (ordered partitions) of n into prime power divisors of n (including 1).at n=35A284839
• Number of compositions (ordered partitions) of n into proper divisors of n.at n=35A294138
• Irregular triangle read by rows: T(n,k) is the number of compositions of 2^n into k powers of 2.at n=40A323840
• Number of compositions of n with distinct differences up to sign.at n=27A325552
• Number of compositions (ordered partitions) of n into distinct parts where no part is a multiple of 3.at n=43A332309
• Number of ways to write n as an ordered sum of ten powers of 2.at n=22A342254
• Number of subsets of {1,2,...,n} such that no two elements differ by 1, 3, or 4.at n=31A351874