Number of permutations of (1,...,n) having n-7 inversions (n>=7).

A005285

Number of permutations of (1,...,n) having n-7 inversions (n>=7).

Terms

    a(0) =1a(1) =7a(2) =35a(3) =155a(4) =649a(5) =2640a(6) =10569a(7) =41926a(8) =165425a(9) =650658a(10) =2554607a(11) =10020277a(12) =39287173a(13) =154022930a(14) =603919164a(15) =2368601685a(16) =9293159292a(17) =36476745510a(18) =143239635450a(19) =562744102479

External references