A049874 a(n)=b(n)-b(n-1), where b=A049862 (differences of products of Fibonacci numbers.)

1, 1, 1, 2, 1, 2, 2, 3, 2, 1, 5, 3, 2, 8, 5, 1, 2, 13, 8, 2, 3, 21, 13, 2, 1, 5, 34, 21, 3, 2, 8, 55, 34, 5, 1, 2, 13, 89, 55, 8, 2, 3, 21, 144, 89, 13, 2, 1, 5, 34, 233, 144, 21, 3, 2, 8, 55, 377, 233, 34, 5, 1, 2, 13, 89, 610, 377, 55, 8, 2, 3, 21, 144, 987, 610, 89, 13, 2, 1

Offset

1,4

Links

Michel Marcus, Table of n, a(n) for n = 1..1010

Prog

(PARI) lista(nn) = {my(out = List([0])); for (i=0, nn, for (j=i+1, nn, listput(out, fibonacci(i)*fibonacci(j)); ); ); my(v = Vec(vecsort(select(x->(x < fibonacci(nn+1)), out), , 8))); vector(#v-1, k, v[k+1] - v[k]); } \\ Michel Marcus, May 27 2019

Crossrefs

Cf. A049862.

Sequence in context: A088431 A254661 A052304 * A060501 A355661 A109129

Adjacent sequences: A049871 A049872 A049873 * A049875 A049876 A049877

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Michel Marcus, May 27 2019

Status

approved