Witt vector *3!/3!.A006178Witt vector *3!/3!.Terms a(0) =1a(1) =7a(2) =93a(3) =1419a(4) =25225a(5) =472037a(6) =9501737a(7) =196190781a(8) =4219610242a(9) =92198459515External referencesoeis: A006178