Number of arrays of n+2 integers in -3..3 with sum zero and adjacent elements differing in absolute value.
A202957
Number of arrays of n+2 integers in -3..3 with sum zero and adjacent elements differing in absolute value.
Terms
- a(0) =20a(1) =108a(2) =414a(3) =1936a(4) =9872a(5) =47732a(6) =229714a(7) =1134036a(8) =5624396a(9) =27808428a(10) =138043018a(11) =688575460a(12) =3440536326a(13) =17214566036a(14) =86312920760a(15) =433540643300
External references
- oeis: A202957