Leading column of triangle in A176463.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =15a(7) =29a(8) =57a(9) =112a(10) =220a(11) =432a(12) =848a(13) =1666a(14) =3273a(15) =6430a(16) =12632a(17) =24816a(18) =48754a(19) =95783a(20) =188177a(21) =369696a(22) =726312a(23) =1426930a(24) =2803381a(25) =5507590a(26) =10820345a(27) =21257915a(28) =41763825a(29) =82050242