OFFSET
0,3
COMMENTS
a(n+1) for n >= 0 is the number of compositions (ordered partitions) of n into parts 1 of 5 sorts and parts 2 of 16 sorts. - Joerg Arndt, Jan 29 2024
LINKS
FORMULA
G.f.: x/(1-5*x-16*x^2).
MATHEMATICA
LinearRecurrence[{5, 16}, {0, 1}, 25] (* Paolo Xausa, Jan 29 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Jan 22 2009
EXTENSIONS
Regularized: a(0) set to 0. - R. J. Mathar, Apr 01 2011
a(21)-a(22) from Paolo Xausa, Jan 29 2024
STATUS
approved