A054097 T(n,3), array T as in A054090.
3, 8, 26, 108, 554, 3392, 24138, 195716, 1781018, 17974584, 199254842, 2406840668, 31466482506, 442700857328, 6669158209514, 107112774491892, 1827078520647098
Offset: 3
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