Even numbers to the right of the central numbers of the (2,1)-Pascal triangle A029653.

Terms

a(0) =4a(1) =14a(2) =6a(3) =20a(4) =50a(5) =8a(6) =182a(7) =112a(8) =44a(9) =10a(10) =294a(11) =156a(12) =54a(13) =672a(14) =450a(15) =210a(16) =12a(17) =1122a(18) =660a(19) =2508a(20) =1782a(21) =352a(22) =90a(23) =14a(24) =4290a(25) =442a(26) =104a(27) =9438a(28) =4004a(29) =546