a(n) = 2*a(n-1) + 24*a(n-2), a(0)=0, a(1)=1.

Terms

a(0) =0a(1) =1a(2) =2a(3) =28a(4) =104a(5) =880a(6) =4256a(7) =29632a(8) =161408a(9) =1033984a(10) =5941760a(11) =36699136a(12) =216000512a(13) =1312780288a(14) =7809572864a(15) =47125872640a(16) =281681494016