Number of -n..n arrays x(0..6) of 7 elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.
A199902
Number of -n..n arrays x(0..6) of 7 elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.
Terms
- a(0) =171a(1) =1783a(2) =8823a(3) =30199a(4) =82555a(5) =193689a(6) =406575a(7) =783989a(8) =1413739a(9) =2414499a(10) =3942247a(11) =6197307a(12) =9431995a(13) =13958869a(14) =20159583a(15) =28494345a(16) =39511979a(17) =53860591a(18) =72298839a(19) =95707807a(20) =125103483a(21) =161649841a(22) =206672527a(23) =261673149a(24) =328344171a(25) =408584411
External references
- oeis: A199902