Number of strings of numbers x(i=1..n) in 0..7 with sum i*x(i)^2 equal to n*49.
A184439
Number of strings of numbers x(i=1..n) in 0..7 with sum i*x(i)^2 equal to n*49.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =14a(4) =101a(5) =715a(6) =3818a(7) =19257a(8) =109623a(9) =541179a(10) =2588583a(11) =12533674a(12) =57289175a(13) =255004484a(14) =1117915131a(15) =4748188269a(16) =19711864941a(17) =80293980695a(18) =319810672333
External references
- oeis: A184439