A027158 a(n) = T(2n,n), T given by A027157.
1, 3, 24, 76, 672, 2208, 20224, 67776, 632320, 2144768, 20238336, 69203968, 658079744, 2263351296, 21643526144, 74764042240, 717975060480, 2488551997440, 23977645834240, 83334108020736, 805090608807936, 2804309838266368
Offset: 0