Sum of numbers on n-th segment of Ulam's spiral.

Terms

a(0) =1a(1) =5a(2) =9a(3) =13a(4) =27a(5) =36a(6) =62a(7) =78a(8) =120a(9) =145a(10) =207a(11) =243a(12) =329a(13) =378a(14) =492a(15) =556a(16) =702a(17) =783a(18) =965a(19) =1065a(20) =1287a(21) =1408a(22) =1674a(23) =1818a(24) =2132a(25) =2301a(26) =2667a(27) =2863a(28) =3285a(29) =3510