First differences of A255071.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =13a(6) =24a(7) =44a(8) =81a(9) =150a(10) =280a(11) =526a(12) =992a(13) =1875a(14) =3551a(15) =6740a(16) =12823a(17) =24450a(18) =46709a(19) =89383a(20) =171325a(21) =328962a(22) =632849a(23) =1219909a(24) =2356217a(25) =4559224a(26) =8835610a(27) =17144046a(28) =33295497a(29) =64705083