Position of first letter of n (in English) in alphabet.

Terms

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