a(n) = Fibonacci(n+1)^4 - Fibonacci(n-1)^4.

Terms

a(0) =0a(1) =1a(2) =15a(3) =80a(4) =609a(5) =4015a(6) =27936a(7) =190385a(8) =1307775a(9) =8956144a(10) =61405905a(11) =420831071a(12) =2884553280a(13) =19770670945a(14) =135511114479a(15) =928804587920