The last number for which a determinant of base-n numbers is nonzero.

Terms

a(0) =14a(1) =25a(2) =61a(3) =121a(4) =211a(5) =337a(6) =505a(7) =721a(8) =991a(9) =1321a(10) =1717a(11) =2185a(12) =2731a(13) =3361a(14) =4081a(15) =4897a(16) =5815a(17) =6841a(18) =7981a(19) =9241a(20) =10627a(21) =12145a(22) =13801a(23) =15601a(24) =17551a(25) =19657a(26) =21925a(27) =24361a(28) =26971a(29) =29761