Number of arrangements of n+1 nonzero numbers x(i) in -2..2 with the sum of floor(x(i)/x(i+1)) equal to zero.
A189491
Number of arrangements of n+1 nonzero numbers x(i) in -2..2 with the sum of floor(x(i)/x(i+1)) equal to zero.
Terms
- a(0) =2a(1) =12a(2) =42a(3) =136a(4) =550a(5) =1892a(6) =7384a(7) =26816a(8) =103288a(9) =386928a(10) =1485566a(11) =5654000a(12) =21736466a(13) =83448592a(14) =321767288a(15) =1241835856a(16) =4803432344a(17) =18605438864a(18) =72168550344a(19) =280295950240
External references
- oeis: A189491