Number of essentially different semi-magic squares of order 3 with semimagic sum n.

Terms

a(0) =1a(1) =2a(2) =7a(3) =14a(4) =29a(5) =49a(6) =83a(7) =127a(8) =192a(9) =273a(10) =384a(11) =519a(12) =694a(13) =902a(14) =1162a(15) =1466a(16) =1835a(17) =2260a(18) =2765a(19) =3340a(20) =4011a(21) =4767a(22) =5637a(23) =6609a(24) =7714a(25) =8939a(26) =10318a(27) =11837a(28) =13532a(29) =15388