Number of arrangements of 6 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.
A188361
Number of arrangements of 6 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =197a(1) =1953a(2) =7369a(3) =22229a(4) =45801a(5) =100885a(6) =163745a(7) =283893a(8) =438373a(9) =678617a(10) =911709a(11) =1386673a(12) =1772141a(13) =2399001a(14) =3175561a(15) =4167365a(16) =5010369a(17) =6549541a(18) =7719713a(19) =9789981a(20) =11867065a(21) =14232893a(22) =16279425a(23) =20224801
External references
- oeis: A188361