'Lucas array': triangular array T read by rows.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =1a(5) =3a(6) =4a(7) =4a(8) =1a(9) =1a(10) =3a(11) =4a(12) =7a(13) =8a(14) =5a(15) =1a(16) =1a(17) =3a(18) =4a(19) =7a(20) =11a(21) =15a(22) =13a(23) =6a(24) =1a(25) =1a(26) =3a(27) =4a(28) =7a(29) =11