Volume of right regular hexagonal pyramid with height and side lengths n, rounded down.

Terms

a(0) =0a(1) =6a(2) =23a(3) =55a(4) =108a(5) =187a(6) =297a(7) =443a(8) =631a(9) =866a(10) =1152a(11) =1496a(12) =1902a(13) =2376a(14) =2922a(15) =3547a(16) =4254a(17) =5050a(18) =5940a(19) =6928a(20) =8020a(21) =9221a(22) =10536a(23) =11971a(24) =13531a(25) =15221a(26) =17045a(27) =19010a(28) =21121a(29) =23382