18187

Appears in sequences

• Number of distinct products i*j*k*l for 1 <= i <= j <= k <= l <= n.at n=36A100437
• Number of nondecreasing integer sequences of length 23 with sum zero and sum of absolute values 2n.at n=13A158157
• Number of (n+3) X 4 0..2 matrices with each 4 X 4 subblock idempotent.at n=8A224721
• T(n,k)=Number of (n+3)X(k+3) 0..2 matrices with each 4X4 subblock idempotent.at n=36A224728
• Semiprimes that are the sum of the first n odd primes for some n.at n=27A274182
• Antidiagonal sums of the array A391685.at n=6A391686