Triangle given by p(n,k)=(coefficient of x^(n-k) in (1/2) ((x+3)^n+(x+1)^n)), 0<=k<=n.

Terms

a(0) =1a(1) =2a(2) =1a(3) =5a(4) =4a(5) =1a(6) =14a(7) =15a(8) =6a(9) =1a(10) =41a(11) =56a(12) =30a(13) =8a(14) =1a(15) =122a(16) =205a(17) =140a(18) =50a(19) =10a(20) =1a(21) =365a(22) =732a(23) =615a(24) =280a(25) =75a(26) =12a(27) =1a(28) =1094a(29) =2555