Maximum water retention of a number octagon of order n.

Terms

a(0) =0a(1) =0a(2) =231a(3) =1378a(4) =4753a(5) =12246a(6) =26335a(7) =50086a(8) =87153a(9) =141778a(10) =218791a(11) =323610a(12) =462241a(13) =641278a(14) =867903a(15) =1149886a(16) =1495585a(17) =1913946a(18) =2414503a(19) =3007378a(20) =3703281a(21) =4513510a(22) =5449951a(23) =6525078a(24) =7751953a(25) =9144226a(26) =10716135a(27) =12482506a(28) =14458753a(29) =16660878