Number of -3..3 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero.
A199938
Number of -3..3 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero.
Terms
- a(0) =6a(1) =30a(2) =142a(3) =660a(4) =3042a(5) =13890a(6) =63260a(7) =287514a(8) =1305394a(9) =5924042a(10) =26877500a(11) =121920302a(12) =553009230a(13) =2508114154a(14) =11375127276a(15) =51589452156
External references
- oeis: A199938