42878
domain: N
Appears in sequences
- Number of permutations that are n-2 "block reversals" away from 12...n.at n=9A007973
- a(n) = n^3 + 3.at n=35A084378
- Number of (w,x,y,z) with all terms in {1,...,n} and w*x+y*z>=n^2.at n=26A212132
- Principal diagonal of the convolution array A213584.at n=14A213585
- Triangle read by rows: T(n,k) = Sum_{i=k..n} C(i-1,i-k)*C(i,k).at n=60A382225