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 A374733 #18 Aug 19 2024 19:41:22 %S A374733 1,2,4,8,16,32,55,110,211,332,664,1310,1441,2882,11704,52874,105748, %T A374733 586805,1145485,5996630,9056596,15962255,41478217,58892999,154782298, %U A374733 452937080,1257466450,7707592196,9675299788,18572052785,46423909990,145470333899,484461788602 %N A374733 a(n) = a(n-1) + rotate(a(n-1), n-2 digits left) with a(1) = 1. %e A374733 a(13) = a(12) + rotate_left(a(12), 11) = 1310 + rotate_left(1310, 11) = 1310 + 0131 = 1441. %t A374733 a[1] = 1; a[n_] := a[n] = a[n - 1] + FromDigits@RotateLeft[IntegerDigits[a[n - 1]], n - 2]; arr = a[#] & /@ Range[1, 100] %Y A374733 Cf. A001127, A051300, A051299, A374731, A374732, A374734. %K A374733 nonn,base,easy %O A374733 1,2 %A A374733 _Nicholas M. R. Frieler_, Jul 17 2024