227569

Properties

Appears in sequences

• Triangle T(n,k) read by rows: number of permutations in [n] with exactly k ascents that have an even number of inversions.at n=51A128612
• Triangle T(n,k) read by rows: number of permutations in [n] with exactly k ascents that have an odd number of inversions.at n=48A128613
• Triangle read by rows: T(n,k) is the number of even permutations of {1,2,...,n} having k descents (n >= 1, k >= 0).at n=44A145882
• Triangle read by rows: T(n,k) is the number of odd permutations of {1,2,...,n} having k descents. (n>=1, k>=1).at n=38A145883
• Primes of the form 2*n^2 + 46*n + 21.at n=29A217495
• Number of nX3 0..2 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.at n=6A222981
• T(n,k)=Number of nXk 0..2 arrays with no more than floor(nXk/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.at n=42A222986
• Number of 7Xn 0..2 arrays with no more than floor(7Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.at n=2A222992
• Prime numbersat n=20230