A348756 Product_{n>=1} (1 + a(n)*x^n) = 1 + x + x^2 + 2 * Sum_{n>=3} a(n)*x^n.
1, 1, 1, 1, 2, 4, 8, 17, 38, 84, 192, 438, 1024, 2388, 5678, 13451, 32354, 77578, 188382, 456006, 1115966, 2722174, 6702450, 16458698, 40734862, 100551658, 249995010, 619974654, 1547115954, 3852068670, 9644512918, 24095760863, 60506814284, 151622914562
Offset: 1