Number of -n..n circular arrays x(0..6) of 7 elements with zero sums of x(i) and x(i)*x((i+1) mod 7).

A202009

Number of -n..n circular arrays x(0..6) of 7 elements with zero sums of x(i) and x(i)*x((i+1) mod 7).

Terms

    a(0) =85a(1) =799a(2) =2605a(3) =7463a(4) =14365a(5) =33699a(6) =53775a(7) =90007a(8) =136473a(9) =213767a(10) =289059a(11) =433343a(12) =552315a(13) =763309a(14) =989675a(15) =1281575a(16) =1548177a(17) =2060815a(18) =2445591a(19) =3041291a(20) =3622123a(21) =4429993a(22) =5095021a(23) =6220341a(24) =7131545a(25) =8453999a(26) =9715693a(27) =11291939a(28) =12624487

External references