The number of perimeter-magic pentagons of order 3 with magic sum n.

Terms

a(0) =1a(1) =9a(2) =33a(3) =75a(4) =233a(5) =374a(6) =742a(7) =1294a(8) =2042a(9) =3029a(10) =4931a(11) =6535a(12) =9507a(13) =13214a(14) =17577a(15) =22762a(16) =31335a(17) =38341a(18) =49660a(19) =62791a(20) =77689a(21) =94239a(22) =119151a(23) =139727a(24) =170553a(25) =204832a(26) =242122a(27) =282811a(28) =340914a(29) =388834