Number of arrays of 7 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.
A201815
Number of arrays of 7 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.
Terms
- a(0) =393a(1) =4145a(2) =23857a(3) =90609a(4) =263201a(5) =637393a(6) =1355145a(7) =2613857a(8) =4675609a(9) =7876401a(10) =12635393a(11) =19464145a(12) =28975857a(13) =41894609a(14) =59064601a(15) =81459393a(16) =110191145a(17) =146519857a(18) =191862609a(19) =247802801a(20) =316099393a(21) =398696145a(22) =497730857a(23) =615544609
External references
- oeis: A201815