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 A374731 #17 Aug 17 2024 13:44:31 %S A374731 1,2,4,8,16,32,55,110,121,332,664,1130,2431,4862,7348,12221,24442, %T A374731 46886,133354,266708,1093378,2027159,4054318,12459749,37057240, %U A374731 74114480,81525928,110341187,220682374,642750611,759178117,876937295,1606524988,10422590237,20845180474,62929698521,84558995506 %N A374731 a(n) = a(n-1) + rotate(a(n-1), n-2 digits right) with a(1) = 1. %e A374731 a(12) = a(11) + rotate(a(11), 11) = 1130 + rotate(1130, 11) = 1130 + 1301 = 2431. %t A374731 a[1] = 1; a[n_] := a[n] = a[n - 1] + FromDigits@RotateRight[IntegerDigits[a[n - 1]], n - 2]; arr = a[#] & /@ Range[0, 100] %Y A374731 Cf. A001127, A051300, A051299, A374732, A374733, A374734. %K A374731 nonn,base,easy %O A374731 1,2 %A A374731 _Nicholas M. R. Frieler_, Jul 17 2024