1/4 the number of arrangements of n+1 nonzero numbers x(i) in -3..3 with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.
A189945
1/4 the number of arrangements of n+1 nonzero numbers x(i) in -3..3 with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.
Terms
- a(0) =5a(1) =15a(2) =63a(3) =384a(4) =2393a(5) =13569a(6) =72744a(7) =393006a(8) =2206620a(9) =12731028a(10) =73789033a(11) =425385252a(12) =2445427072a(13) =14098065430a(14) =81698759400a(15) =475327637850
External references
- oeis: A189945