Number of times n occurs in A000195.

Terms

a(0) =2a(1) =5a(2) =13a(3) =34a(4) =94a(5) =255a(6) =693a(7) =1884a(8) =5123a(9) =13923a(10) =37848a(11) =102880a(12) =279659a(13) =760191a(14) =2066413a(15) =5617093a(16) =15268842a(17) =41505017a(18) =112822331a(19) =306682895a(20) =833650539a(21) =2266097112a(22) =6159890600a(23) =16744318683a(24) =45515777208a(25) =123724710091a(26) =336318631173a(27) =914208823690