a(n) = (2*n+1)*(3*n+1)*(4*n+1)*(5*n+1).

Terms

a(0) =1a(1) =360a(2) =3465a(3) =14560a(4) =41769a(5) =96096a(6) =191425a(7) =344520a(8) =575025a(9) =905464a(10) =1361241a(11) =1970640a(12) =2764825a(13) =3777840a(14) =5046609a(15) =6610936a(16) =8513505a(17) =10799880a(18) =13518505a(19) =16720704a(20) =20460681a(21) =24795520a(22) =29785185a(23) =35492520a(24) =41983249a(25) =49325976a(26) =57592185a(27) =66856240a(28) =77195385