Rightmost diagonal of triangle A115323.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =17a(5) =43a(6) =114a(7) =308a(8) =837a(9) =2294a(10) =6330a(11) =17603a(12) =49255a(13) =138359a(14) =390374a(15) =1105655a(16) =3142141a(17) =8956264a(18) =25592485a(19) =73305487a(20) =210435337a(21) =605304274a(22) =1744271476a(23) =5034584633a(24) =14553714389a(25) =42129545594a(26) =122112130949a(27) =354362929036