Row sums of number triangle A105848.

Terms

a(0) =1a(1) =3a(2) =9a(3) =28a(4) =91a(5) =308a(6) =1079a(7) =3888a(8) =14332a(9) =53810a(10) =205075a(11) =791250a(12) =3084504a(13) =12129506a(14) =48056095a(15) =191633546a(16) =768535768a(17) =3097705378a(18) =12541851048a(19) =50983349848a(20) =208003171266a(21) =851412895348