Number of strings of n numbers x(i) in -4..4 with sums of x(i) and of x(i)*x(i+1) both zero.
A183939
Number of strings of n numbers x(i) in -4..4 with sums of x(i) and of x(i)*x(i+1) both zero.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =33a(4) =321a(5) =1411a(6) =10613a(7) =70449a(8) =534153a(9) =3908739a(10) =31172293a(11) =247959153a(12) =2040991681a(13) =16818777105a(14) =139873091535
External references
- oeis: A183939