Row lengths in A261644.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =7a(6) =15a(7) =27a(8) =49a(9) =90a(10) =171a(11) =326a(12) =613a(13) =1174a(14) =2255a(15) =4333a(16) =8386a(17) =16213a(18) =31457a(19) =61097a(20) =118577a(21) =230322a(22) =447767a(23) =870570a(24) =1693887a(25) =3297343a(26) =6423347a(27) =12523562a(28) =24435171a(29) =47707012