A026555 a(n)=T(n,n-2), T given by A026552. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=2.

1, 2, 7, 13, 40, 76, 226, 434, 1279, 2470, 7267, 14085, 41462, 80584, 237484, 462620, 1365014, 2664276, 7870226, 15387670, 45501743, 89097932, 263707094, 517058502, 1531614109, 3006637946, 8912678569, 17514547015, 51952990090