OFFSET
1,2
MAPLE
a := proc(n) option remember;
`if`(n < 4, [1, 2, 3][n], abs(a(n - 1) - a(Bits:-Iff(n - 2$2) + 3 - n)))
end:
seq(a(n), n = 1..90); # Petros Hadjicostas, Nov 08 2019
PROG
(PARI) lista(nn) = {nn = max(nn, 3); my(va = vector(nn)); va[1] = 1; va[2] = 2; va[3] = 3; for(n=4, nn, va[n] = abs(va[n-1] - va[2 - n + 2*2^logint(n-2, 2)])); va; } \\ Petros Hadjicostas, May 15 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Name edited by Petros Hadjicostas, Nov 08 2019
STATUS
approved