Number of strings of numbers x(i=1..7) in 0..n with sum i^3*x(i)^2 equal to 343*n^2.

Terms

a(0) =1a(1) =2a(2) =4a(3) =19a(4) =21a(5) =65a(6) =82a(7) =278a(8) =261a(9) =551a(10) =650a(11) =1608a(12) =1339a(13) =2645a(14) =2506a(15) =6462a(16) =4736a(17) =7722a(18) =8261a(19) =17638a(20) =12061a(21) =20988a(22) =20482a(23) =40829a(24) =28797a(25) =46485a(26) =41543a(27) =88400a(28) =61485a(29) =84252