A047001 Sum{T(i,n-i): i=0,1,...,n}, array T given by A047000.
1, 2, 3, 6, 8, 15, 30, 52, 101, 202, 376, 740, 1480, 2840, 5625, 11250, 21928, 43583, 87166, 171420, 341412, 682824, 1350144, 2692536, 5385072, 10684872, 21326481, 42652962, 84825224, 169403773, 338807546, 674852332, 1348273949
Offset: 0