Column limit of A127119.

Terms

a(0) =1a(1) =3a(2) =12a(3) =41a(4) =140a(5) =457a(6) =1485a(7) =4732a(8) =14986a(9) =47025a(10) =146784a(11) =455683a(12) =1409122a(13) =4341456a(14) =13336440a(15) =40858875a(16) =124894889a(17) =380993722a(18) =1160145321a(19) =3527008680a(20) =10707133507a(21) =32461710583a(22) =98300107420a(23) =297348593017a(24) =898559807247