Half the number of 0..4 arrays of length n+2 with second differences nonzero.
A212778
Half the number of 0..4 arrays of length n+2 with second differences nonzero.
Terms
- a(0) =56a(1) =252a(2) =1134a(3) =5104a(4) =22972a(5) =103391a(6) =465336a(7) =2094360a(8) =9426184a(9) =42424863a(10) =190943548a(11) =859388488a(12) =3867889651a(13) =17408390437a(14) =78350750657a(15) =352636859298
External references
- oeis: A212778