Write 0,1,2,3,4,... in a triangular spiral; then a(n) is the sequence found by reading the terms along the line from 0 in the direction 0,2,...

A062708

Write 0,1,2,3,4,... in a triangular spiral; then a(n) is the sequence found by reading the terms along the line from 0 in the direction 0,2,...

Terms

    a(0) =0a(1) =2a(2) =13a(3) =33a(4) =62a(5) =100a(6) =147a(7) =203a(8) =268a(9) =342a(10) =425a(11) =517a(12) =618a(13) =728a(14) =847a(15) =975a(16) =1112a(17) =1258a(18) =1413a(19) =1577a(20) =1750a(21) =1932a(22) =2123a(23) =2323a(24) =2532a(25) =2750a(26) =2977a(27) =3213a(28) =3458a(29) =3712

External references