Row sums of unsigned triangle A062991.

Terms

a(0) =1a(1) =3a(2) =13a(3) =67a(4) =381a(5) =2307a(6) =14589a(7) =95235a(8) =636925a(9) =4341763a(10) =30056445a(11) =210731011a(12) =1493303293a(13) =10678370307a(14) =76957679613a(15) =558403682307