A027287 Self-convolution of array T given by A026009.
1, 2, 6, 15, 54, 118, 471, 973, 4128, 8262, 36481, 71534, 324876, 627926, 2911923, 5568348, 26241376, 49767432, 237550401, 447567059, 2158650078, 4045351674, 19679880649, 36716551814, 179920446576, 334415846660
Offset: 0