A047116 T(n,n+1), array T as in A047110.
1, 2, 5, 19, 62, 206, 771, 2787, 10075, 37936, 142127, 532438, 2025548, 7717368, 29431808, 112981883, 434717592, 1674938528, 6474529712, 25076461217, 97253412518, 377901902151, 1470624876338, 5729633180125, 22352003680730
Offset: 0