A120897 Row sums of triangle A120894 (cascadence of 1+x+x^2).
1, 3, 10, 33, 106, 336, 1056, 3296, 10234, 31648, 97551, 299888, 919865, 2816291, 8608712, 26278538, 80120533, 244022331, 742525242, 2257527861, 6858558246, 20822959508, 63181453350, 191601205342, 580749971840, 1759465640586
Offset: 0