1,6
a(n) is the "level" of odd numbers.
The decomposition of odd numbers into weight * level + gap is A005408(n) = A090368(n-1) * a(n) + 2 if a(n) > 0.
Rémi Eismann, Table of n, a(n) for n = 1..10000
For n = 3 we have A005408(2)/A090368(2)= 3 / 3 = 1; hence a(3) = 1.
For n = 24 we have A005408(23)/A090368(23)= 45 / 3 = 14; hence a(24) = 15.
Cf. A005408, A090368, A117078, A117563, A001223.
Sequence in context: A294951 A101443 A228037 * A046230 A046229 A255670
Adjacent sequences: A184723 A184724 A184725 * A184727 A184728 A184729
nonn
Rémi Eismann, Jan 20 2011
approved