OFFSET
1,3
MAPLE
s := proc(n) option remember; `if`(n < 1, 0, a(n) + s(n - 1)) end proc:
a := proc(n) option remember;
`if`(n < 4, [1, 1, 4][n], s(n - 1) - a(-2^ceil(-1 + log[2](n - 1)) + n - 1)):
end proc:
seq(a(n), n = 1..40); # Petros Hadjicostas, Nov 19 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Name edited by Petros Hadjicostas, Nov 19 2019
STATUS
approved