A077837 Expansion of (1-x)/(1-3*x-3*x^2-2*x^3).

1, 2, 9, 35, 136, 531, 2071, 8078, 31509, 122903, 479392, 1869903, 7293691, 28449566, 110969577, 432844811, 1688342296, 6585500475, 25687217935, 100194839822, 390817174221, 1524410477999, 5946072636304, 23193083691351, 90466289938963, 352870266163550