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

Terms

a(0) =8a(1) =91a(2) =580a(3) =2574a(4) =8939a(5) =26146a(6) =67105a(7) =155645a(8) =332729a(9) =665317a(10) =1257898a(11) =2268061a(12) =3925640a(13) =6557703a(14) =10618287a(15) =16725802a(16) =25706637a(17) =38648840a(18) =56963074a(19) =82456645a(20) =117416301a(21) =164706836a(22) =227880334a(23) =311304767a(24) =420304310a(25) =561323415a(26) =742104234