Tribonacci numbers that start with first three squares.

Terms

a(0) =1a(1) =4a(2) =9a(3) =14a(4) =27a(5) =50a(6) =91a(7) =168a(8) =309a(9) =568a(10) =1045a(11) =1922a(12) =3535a(13) =6502a(14) =11959a(15) =21996a(16) =40457a(17) =74412a(18) =136865a(19) =251734a(20) =463011a(21) =851610a(22) =1566355a(23) =2880976a(24) =5298941a(25) =9746272a(26) =17926189a(27) =32971402a(28) =60643863a(29) =111541454