A028286 Even elements to right of central elements in 4-Pascal triangle A028275.

6, 16, 8, 86, 40, 10, 196, 126, 50, 322, 176, 12, 714, 498, 1212, 310, 86, 14, 2640, 396, 100, 2992, 496, 16, 17446, 12012, 6370, 2548, 742, 148, 18, 37180, 29458, 18382, 8918, 3290, 890, 166, 66638, 47840, 27300, 12208, 4180, 1056, 20, 140998, 114478