a(1) = 0; a(2) = a(3) = 1; for n > 3: a(n) = 16*a(n-2)+14*a(n-3).

Terms

a(0) =0a(1) =1a(2) =1a(3) =16a(4) =30a(5) =270a(6) =704a(7) =4740a(8) =15044a(9) =85696a(10) =307064a(11) =1581752a(12) =6112768a(13) =29606928a(14) =119948816a(15) =559289600a(16) =2333678048a(17) =10627917024a(18) =45168903168a(19) =202718165056a(20) =871493289024