Number of fixed points of mirroring operation on solid partitions.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =13a(5) =24a(6) =39a(7) =68a(8) =110a(9) =182a(10) =288a(11) =468a(12) =728a(13) =1150a(14) =1770a(15) =2751a(16) =4175a(17) =6388a(18) =9597a(19) =14495a(20) =21571a(21) =32200a(22) =47498