Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and permanent=trace.

Terms

a(0) =1a(1) =19a(2) =60a(3) =116a(4) =196a(5) =292a(6) =404a(7) =548a(8) =708a(9) =868a(10) =1060a(11) =1284a(12) =1524a(13) =1796a(14) =2052a(15) =2292a(16) =2612a(17) =2980a(18) =3348a(19) =3748a(20) =4116a(21) =4452a(22) =4884a(23) =5380a(24) =5844a(25) =6324a(26) =6820a(27) =7300a(28) =7860a(29) =8468