Number of strings of n+2 numbers x(i) in -2..2 with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other.
A184054
Number of strings of n+2 numbers x(i) in -2..2 with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other.
Terms
- a(0) =1a(1) =9a(2) =31a(3) =107a(4) =501a(5) =2339a(6) =10303a(7) =44523a(8) =198695a(9) =888601a(10) =3941855a(11) =18017983a(12) =83483541a(13) =389450325a(14) =1838319253a(15) =8707491533a(16) =41316656737a(17) =196349474191a(18) =934444664373
External references
- oeis: A184054