108020

Appears in sequences

• a(n) = Sum_{i=1..n} binomial(i+1,2)^5.at n=3A085440
• Icosagonal numbers divisible by 20.at n=22A117798
• Number of (n+1)X(5+1) arrays of permutations of 0..n*6+5 with each element having directed index change 0,0 1,1 0,-1 -1,1 or 0,-2.at n=2A264241
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 0,0 1,1 0,-1 -1,1 or 0,-2.at n=23A264244
• Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,0 1,1 0,-1 -1,1 or 0,-2.at n=4A264247
• Array read by antidiagonals: T(n,k) = Sum_{i=1..n} binomial(1+i,2)^k.at n=49A334781