Secondary diagonal of triangle A122890.

Terms

a(0) =1a(1) =10a(2) =70a(3) =424a(4) =2382a(5) =12804a(6) =66946a(7) =343772a(8) =1744314a(9) =8780912a(10) =43976688a(11) =219546976a(12) =1094132461a(13) =5448766458a(14) =27135655714a(15) =135218356264a(16) =674461583180