Maximum water retention of a number square of order n.

Terms

a(0) =0a(1) =0a(2) =5a(3) =26a(4) =84a(5) =222a(6) =488a(7) =946a(8) =1664a(9) =2723a(10) =4227a(11) =6277a(12) =8993a(13) =12514a(14) =16976a(15) =22538a(16) =29364a(17) =37649a(18) =47563a(19) =59321a(20) =73149a(21) =89254a(22) =107892a(23) =129308a(24) =153764a(25) =181547a(26) =212931a(27) =248223a(28) =287747a(29) =331780