Main diagonal of square array A096589.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =14a(5) =28a(6) =44a(7) =90a(8) =136a(9) =254a(10) =406a(11) =716a(12) =1134a(13) =1952a(14) =3010a(15) =5232a(16) =8168a(17) =13298a(18) =21048a(19) =33900a(20) =53708a(21) =86316a(22) =132280a(23) =214756a(24) =327358a(25) =527300a(26) =799434a(27) =1269184a(28) =1931804a(29) =3070162