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 A351689 #37 Oct 04 2024 00:26:02 %S A351689 1,14,21,176,220,264,308,352,2466,2740,3014,3288,3562,3836,4110,4384, %T A351689 4658,4932,5206,5480,5754,37510,39215,40920,42625,44330,46035,47740, %U A351689 49445,51150,52855,54560,56265,57970,59675,61380,63085,64790,66495,68200,69905,71610 %N A351689 a(n) is the number in the first column of the Trithoff (tribonacci) array that starts off the row containing the tail of n times the tribonacci sequence. %C A351689 The sequence is increasing. %C A351689 a(n) is divisible by n. %C A351689 The row number where the tail of n times tribonacci numbers appears in the Trithoff array form sequence A351685. %e A351689 Consider twice the tribonacci numbers: 0, 0, 2, 2, 4, 8, 14, 26, 48, and so on. The first few terms can be found in the first row of the Trithoff array A136175. The tail starting with 14, 26, and 48 is the seventh row of the Trithoff array. The first number in the seventh row is 14. Thus, a(2) = 14. %Y A351689 Cf. A000073, A136175, A351685. %K A351689 nonn %O A351689 1,2 %A A351689 _Tanya Khovanova_ and PRIMES STEP Senior group, May 08 2022