First row of A113439.

Terms

a(0) =1a(1) =2a(2) =8a(3) =34a(4) =146a(5) =627a(6) =2689a(7) =11521a(8) =49337a(9) =211233a(10) =904306a(11) =3871305a(12) =16572812a(13) =70947073a(14) =303719624a(15) =1300203634a(16) =5566087073a(17) =23828058969a(18) =102006385362a(19) =436682772844