0,3

Seiichi Manyama, Table of n, a(n) for n = 0..10000

G.f. A(x) satisfies: A(x) = x * (1 + 2*x + 3*x^2) * (1 + A(x^4)).

Table[Times @@ IntegerDigits[n, 4], {n, 0, 100}]

Cf. A007090, A007954, A053737.

Sequence in context: A049804 A277904 A132387 * A124757 A242305 A049263

Adjacent sequences: A309951 A309952 A309953 * A309955 A309956 A309957

nonn,base

Ilya Gutkovskiy, Aug 24 2019

approved