Even elements in 3-Pascal triangle A028262 (by row).

Terms

a(0) =4a(1) =4a(2) =8a(3) =6a(4) =6a(5) =26a(6) =8a(7) =26a(8) =26a(9) =8a(10) =34a(11) =90a(12) =34a(13) =10a(14) =10a(15) =148a(16) =266a(17) =322a(18) =266a(19) =148a(20) =12a(21) =64a(22) =414a(23) =588a(24) =588a(25) =414a(26) =64a(27) =12a(28) =76a(29) =1002