A skew Pell-Pascal triangle.

Terms

a(0) =1a(1) =0a(2) =2a(3) =0a(4) =1a(5) =5a(6) =0a(7) =0a(8) =4a(9) =12a(10) =0a(11) =0a(12) =1a(13) =14a(14) =29a(15) =0a(16) =0a(17) =0a(18) =6a(19) =44a(20) =70a(21) =0a(22) =0a(23) =0a(24) =1a(25) =27a(26) =131a(27) =169a(28) =0a(29) =0