28823

Appears in sequences

• Numerator of Sum_{k=1..n} k^4 / Product_{k=1..n} k^4.at n=17A181426
• 41 times triangular numbers.at n=37A195038
• a(n) = (n+1)*(n-2)*(n-3)/2.at n=38A212343
• Number of (n+1)X(2+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise.at n=4A235654
• Number of (n+1)X(5+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise.at n=1A235657
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise.at n=16A235660
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise.at n=19A235660
• Numbers k such that phi(k) = phi(2*k-1) where phi is the Euler totient function (A000010).at n=5A333407