Number of strings of numbers x(i=1..9) in 0..n with sum i^2*x(i) equal to n*81.

Terms

a(0) =3a(1) =37a(2) =339a(3) =1805a(4) =7250a(5) =23611a(6) =65909a(7) =163588a(8) =369777a(9) =775045a(10) =1525468a(11) =2847243a(12) =5078854a(13) =8712108a(14) =14442500a(15) =23231857a(16) =36384941a(17) =55641864a(18) =83284699a(19) =122267246a(20) =176362928a(21) =250341134a(22) =350161711a(23) =483206291a(24) =658533921a(25) =887179738a(26) =1182476762