This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A088133 #10 Apr 24 2024 13:00:11
%S A088133 0,2,4,6,8,10,12,14,16,18,1,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,11,
%T A088133 3,4,5,6,7,8,9,10,11,12,4,5,6,7,8,9,10,11,12,13,5,6,7,8,9,10,11,12,13,
%U A088133 14,6,7,8,9,10,11,12,13,14,15,7,8,9,10,11,12,13,14,15,16,8,9,10,11,12,13,14
%N A088133 Sum of first and last digits of n. Different from A115299.
%F A088133 a(n) = A000030(n) + A010879(n). - _M. F. Hasler_, Apr 22 2024
%t A088133 Total[{First[IntegerDigits[#]],Last[IntegerDigits[#]]}]&/@Range[90] (* _Harvey P. Dale_, Aug 21 2018 *)
%o A088133 (PARI) apply( {A088133(n)=n\10^logint(n+!n, 10)+n%10}, [0..99]) \\ _M. F. Hasler_, Apr 22 2024
%o A088133 (Python) list(map(A088133 := lambda n: int(str(n)[0])+n%10, range(99))) # _M. F. Hasler_, Apr 22 2024
%Y A088133 Cf. A000030 (first digit of n), A010879 (last digit of n).
%Y A088133 Cf. A046704, A007953, A088134, A088135, A088136.
%K A088133 easy,nonn,base
%O A088133 0,2
%A A088133 _Zak Seidov_, Sep 20 2003
%E A088133 Extended to a(0) = 0 by _M. F. Hasler_, Apr 22 2024