First differences of A115855.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =9a(5) =14a(6) =23a(7) =48a(8) =82a(9) =55a(10) =250a(11) =100a(12) =469a(13) =2213a(14) =2232a(15) =296a(16) =6623a(17) =489a(18) =29495a(19) =89362a(20) =35815a(21) =1254a(22) =259171a(23) =411355a(24) =176134a(25) =952660a(26) =3819125a(27) =4564a(28) =9371908a(29) =6841