Number of arrays of 9 integers in -n..n with sum zero and the sum of every adjacent pair being odd.
A202080
Number of arrays of 9 integers in -n..n with sum zero and the sum of every adjacent pair being odd.
Terms
- a(0) =6a(1) =726a(2) =8412a(3) =80812a(4) =340660a(5) =1516410a(6) =4213042a(7) =12861252a(8) =28421280a(9) =69306670a(10) =132493530a(11) =278307730a(12) =481381744a(13) =909136644a(14) =1461430338a(15) =2548699638a(16) =3874036128a(17) =6350628468a(18) =9236088510a(19) =14409332790a(20) =20220953874a(21) =30295374604
External references
- oeis: A202080