a(n) = (a(n-1) * a(n-6) + a(n-3) * a(n-4)) / a(n-7) (a variant of Somos-7).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =4a(10) =6a(11) =12a(12) =24a(13) =72a(14) =144a(15) =288a(16) =864a(17) =3456a(18) =10368a(19) =41472a(20) =124416a(21) =497664a(22) =2985984a(23) =17915904a(24) =71663616a(25) =429981696a(26) =2579890176a(27) =20639121408a(28) =185752092672