a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) for n >= 4 starting with a(0) = 1, a(1) = 2, a(2) = 4, and a(3) = 6.

A131885

a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) for n >= 4 starting with a(0) = 1, a(1) = 2, a(2) = 4, and a(3) = 6.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =6a(4) =8a(5) =12a(6) =24a(7) =56a(8) =128a(9) =272a(10) =544a(11) =1056a(12) =2048a(13) =4032a(14) =8064a(15) =16256a(16) =32768a(17) =65792a(18) =131584a(19) =262656a(20) =524288a(21) =1047552a(22) =2095104a(23) =4192256a(24) =8388608a(25) =16781312a(26) =33562624a(27) =67117056a(28) =134217728a(29) =268419072

External references