A027134 a(n) = self-convolution of row n of array T given by A027113.
1, 5, 18, 76, 311, 1245, 4882, 18818, 71529, 268785, 1000422, 3693814, 13545669, 49382777, 179117070, 646786228, 2326351527, 8338190053, 29792805066, 106152792682, 377267681865, 1337727360957, 4733406748722, 16716506981356
Offset: 0