Question

Продолжте ряд чисел 0, 1, 3, 12, 45, 171,

Answer 1

0, 1, 3, 12, 45, 171, 648, 2457, 9315, 35316, 133893, 507627, 1924560, 7296561, 27663363, 104879772, 397629405, 1507527531, 5715470808, ...