a(n) = 2^n*A056236(n).

Terms

a(0) =2a(1) =8a(2) =48a(3) =320a(4) =2176a(5) =14848a(6) =101376a(7) =692224a(8) =4726784a(9) =32276480a(10) =220397568a(11) =1504968704a(12) =10276569088a(13) =70172803072a(14) =479169871872