Reduced third-order Patalan numbers.

Terms

a(0) =1a(1) =1a(2) =1a(3) =5a(4) =10a(5) =66a(6) =154a(7) =1122a(8) =2805a(9) =21505a(10) =55913a(11) =442221a(12) =1179256a(13) =9524760a(14) =25852920a(15) =211993944a(16) =582983346a(17) =4835332458a(18) =13431479050a(19) =112400272050a(20) =314720761740