Triangle read by rows: T(n, k) = 2^k * hypergeom([-n, -k], [], 1/2).

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =4a(5) =14a(6) =1a(7) =5a(8) =22a(9) =86a(10) =1a(11) =6a(12) =32a(13) =152a(14) =648a(15) =1a(16) =7a(17) =44a(18) =248a(19) =1256a(20) =5752a(21) =1a(22) =8a(23) =58a(24) =380a(25) =2248a(26) =12032a(27) =58576a(28) =1a(29) =9