A014260 Iccanobif numbers: add a(n-1) to reversal of a(n-2).

0, 1, 1, 2, 3, 5, 8, 13, 21, 52, 64, 89, 135, 233, 764, 1096, 1563, 8464, 12115, 16763, 67884, 104645, 153521, 699922, 825273, 1055269, 1427797, 11053298, 19030539, 108265550, 201768641, 257331442, 404198544, 648332296, 1094223700, 1786457546, 1859682447

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• base
• easy

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A000045, A001129, A014258, A014259.

Programs

Maple

R:= n-> (s-> parse(cat(s[-i]$i=1..length(s))))(""||n):
a:= proc(n) option remember; `if`(n<2, n,
       a(n-1) +R(a(n-2)))
    end:
seq(a(n), n=0..50);  # Alois P. Heinz, Jun 18 2014

Mathematica

Clear[ Bif ]; Bif[ 0 ]=0; Bif[ 1 ]=1; Bif[ n_Integer ] := Bif[ n ]=Bif[ n-1 ]+Plus@@(IntegerDigits[ Bif[ n-2 ], 10 ]//(#*Array[ 10^#&, Length[ # ], 0 ])&); Array[ Bif, 40, 0 ]
nxt[{a_,b_}]:={b,IntegerReverse[a]+b}; NestList[nxt,{0,1},40][[All,1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 04 2018 *)

PARI

lista(nn) = my(v=vector(nn)); v[2]=1; for(n=3, nn, v[n] = v[n-1] + fromdigits(Vecrev(digits(v[n-2])))); v \\ Jinyuan Wang, Aug 01 2021