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 A366781 #10 Oct 23 2023 05:22:31
%S A366781 0,0,1,2,1,1,4,3,4,1,2,6,3,3,8,5,2,3,4,4,3,6,4,3,4,4,3,8,4,5,11,6,4,4,
%T A366781 10,5,5,5,9,4,2,4,2,6,5,4,11,11,2,6,7,9,3,5,9,6,2,3,5,8,12,5,11,12,4,
%U A366781 2,4,6,3,3,6,6,2,10,7,8,7,5,12,7,4,2,6,4
%N A366781 Number of prime divisors of A000073(n) (tribonacci numbers) (counted with multiplicity).
%H A366781 Amiram Eldar, <a href="/A366781/b366781.txt">Table of n, a(n) for n = 2..365</a>
%F A366781 a(n) = A001222(A000073(n)).
%e A366781 a(8)=4 because the 8th tribonacci number 24 = 2^3*3 has 4 prime factors.
%t A366781 PrimeOmega[LinearRecurrence[{1, 1, 1}, {1, 1, 2}, 84]] (* _Amiram Eldar_, Oct 23 2023 *)
%Y A366781 Cf. A000073, A001222, A022307, A366780, A366782.
%K A366781 nonn
%O A366781 2,4
%A A366781 _Sean A. Irvine_, Oct 22 2023