Number of strings of numbers x(i=1..6) in 0..n with sum i*x(i) equal to n*6.

Terms

a(0) =4a(1) =21a(2) =74a(3) =207a(4) =476a(5) =985a(6) =1842a(7) =3226a(8) =5325a(9) =8414a(10) =12766a(11) =18789a(12) =26860a(13) =37525a(14) =51301a(15) =68893a(16) =90956a(17) =118400a(18) =152035a(19) =192973a(20) =242223a(21) =301121a(22) =370866a(23) =453070a(24) =549139a(25) =660950a(26) =790169a(27) =938961a(28) =1109233a(29) =1303498