Triangle of generalized Stirling numbers S_{2,2}(n,k) read by rows (n>=1, 2<=k<=2n).

Terms

a(0) =1a(1) =2a(2) =4a(3) =1a(4) =4a(5) =32a(6) =38a(7) =12a(8) =1a(9) =8a(10) =208a(11) =652a(12) =576a(13) =188a(14) =24a(15) =1a(16) =16a(17) =1280a(18) =9080a(19) =16944a(20) =12052a(21) =3840a(22) =580a(23) =40a(24) =1a(25) =32a(26) =7744a(27) =116656a(28) =412800a(29) =540080