Total area below all skew Dyck paths of semilength n.

Terms

a(0) =0a(1) =1a(2) =9a(3) =58a(4) =336a(5) =1853a(6) =9945a(7) =52487a(8) =273939a(9) =1418567a(10) =7303791a(11) =37441560a(12) =191287254a(13) =974642943a(14) =4955123955a(15) =25146686730a(16) =127424717400a(17) =644873878895