A047106 T(n,n+1), array T as in A047100.
1, 2, 6, 21, 73, 261, 957, 3547, 13267, 50027, 189780, 723456, 2769333, 10637790, 40984228, 158306891, 612856611, 2377260192, 9237543329, 35951472496, 140116098727, 546778366195, 2136168391753, 8354417782742, 32705042089703
Offset: 0