Right edge of triangle A297497.

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =16a(5) =38a(6) =90a(7) =205a(8) =448a(9) =958a(10) =2053a(11) =4469a(12) =9865a(13) =21849a(14) =48061a(15) =104528a(16) =225121a(17) =482604a(18) =1035645a(19) =2232465a(20) =4834839a(21) =10493118a(22) =22741212a(23) =49074143a(24) =105310104a(25) =224848260a(26) =478534828a(27) =1017589272a(28) =2166420555a(29) =4622251945