Expansion of (1-x)/(1-2*x-2*x^2-2*x^3).

Terms

a(0) =1a(1) =1a(2) =4a(3) =12a(4) =34a(5) =100a(6) =292a(7) =852a(8) =2488a(9) =7264a(10) =21208a(11) =61920a(12) =180784a(13) =527824a(14) =1541056a(15) =4499328a(16) =13136416a(17) =38353600a(18) =111978688a(19) =326937408a(20) =954539392a(21) =2786910976a(22) =8136775552a(23) =23756451840a(24) =69360276736a(25) =202507008256a(26) =591247473664