a(1)=11, If a(n-1)=abcde..., where a,b,c,d,e... are the digits, then a(n)=abcde...+a*bcde...+ab*cde...+abc*de...+abcd*e...+....

A108722

a(1)=11, If a(n-1)=abcde..., where a,b,c,d,e... are the digits, then a(n)=abcde...+a*bcde...+ab*cde...+abc*de...+abcd*e...+....

Terms

    a(0) =11a(1) =12a(2) =14a(3) =18a(4) =26a(5) =38a(6) =62a(7) =74a(8) =102a(9) =124a(10) =196a(11) =406a(12) =670a(13) =1090a(14) =2080a(15) =3840a(16) =7880a(17) =20280a(18) =42600a(19) =78200a(20) =151200a(21) =250600a(22) =516800a(23) =1360400a(24) =3104400a(25) =6159600a(26) =20352200a(27) =47244600a(28) =158847200a(29) =705347800

External references