a(n) is the smallest number that is the sum of n positive 4th powers in two ways.

Terms

a(0) =635318657a(1) =2673a(2) =259a(3) =260a(4) =261a(5) =262a(6) =263a(7) =264a(8) =265a(9) =266a(10) =267a(11) =268a(12) =269a(13) =270a(14) =256a(15) =257a(16) =258a(17) =259a(18) =260a(19) =261a(20) =262a(21) =263a(22) =264a(23) =265a(24) =266a(25) =267a(26) =268a(27) =269a(28) =270a(29) =271