a(n) is the number of zeros needed to write the integers 1 through Fibonacci(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =2a(8) =3a(9) =5a(10) =8a(11) =24a(12) =43a(13) =67a(14) =121a(15) =188a(16) =409a(17) =708a(18) =1228a(19) =1946a(20) =4131a(21) =6241a(22) =10525a(23) =17866a(24) =29428a(25) =58369a(26) =87881a(27) =156261a(28) =255242a(29) =412545