(A144325(n)^2 + A144313(n)^2 + A144315(n)^2) / 3.

Terms

a(0) =10817a(1) =25153a(2) =45969a(3) =158377a(4) =206313a(5) =855113a(6) =1379273a(7) =1573833a(8) =2233913a(9) =3101849a(10) =3663737a(11) =4880169a(12) =5446849a(13) =5795377a(14) =6374833a(15) =6710249a(16) =7788217a(17) =8673409a(18) =10280489a(19) =10737713a(20) =11401337a(21) =11917969a(22) =12744377a(23) =13922289a(24) =16282793