Number of arrays of n+2 integers in -3..3 with sum zero and the sum of every adjacent pair being odd.

A202071

Number of arrays of n+2 integers in -3..3 with sum zero and the sum of every adjacent pair being odd.

Terms

    a(0) =10a(1) =56a(2) =78a(3) =0a(4) =1014a(5) =5832a(6) =8412a(7) =0a(8) =118560a(9) =691352a(10) =1009378a(11) =0a(12) =14741482a(13) =86567880a(14) =127201108a(15) =0a(16) =1895190810a(17) =11176778256a(18) =16487950878a(19) =0a(20) =248820363000a(23) =0

External references