Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero.

A190076

Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero.

Terms

    a(0) =40a(1) =1896a(2) =28656a(3) =191456a(4) =834717a(5) =2783714a(6) =7737762a(7) =18951546a(8) =41786130a(9) =84902980a(10) =162378720a(11) =292892946a(12) =503182507a(13) =835582280a(14) =1339061119a(15) =2077237619a(16) =3144963614a(17) =4653920446a(18) =6746522401a(19) =9597835033a(20) =13398597773a(21) =18439060711

External references