A047148 T(n,n+3), array T as in A047140.
1, 3, 9, 38, 96, 277, 1421, 2464, 6654, 61802, 293298, 977440, 3457374, 15961755, 68638807, 261722656, 993323854, 4081202724, 16722068344, 65831346572, 256639112606, 1025719342194, 4118393609362, 16324710723952
Offset: 0