Number of strings of numbers x(i=1..n) in 0..7 with sum i^2*x(i) equal to n^2*7.

A183951

Number of strings of numbers x(i=1..n) in 0..7 with sum i^2*x(i) equal to n^2*7.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =32a(4) =161a(5) =770a(6) =3539a(7) =15601a(8) =65909a(9) =268008a(10) =1051270a(11) =3988203a(12) =14668943a(13) =52424801a(14) =182419618a(15) =619151665a(16) =2053195642a(17) =6662236128a(18) =21181322973a(19) =66063536142a(20) =202362531609a(21) =609394911084

External references