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 A233268 #16 May 22 2014 03:31:33 %S A233268 1,2,3,6,10,17,30,53,95,171,310,564,1036,1918,3574,6691,12566,23653, %T A233268 44610,84309,159698,303253,577352,1102121,2109448,4047967,7787277, %U A233268 15015347,29011671,56150867,108825599,211127246,409886210,796134319,1546848744,3006198333,5843799964 %N A233268 The middle point of row n in binary beanstalk related sequences A179016, A218602, A218616, A233270, A233271. %C A233268 a(n) points to the center of each palindromic row/subrange of A233270, and to the lower position nearest to the center, if the length of range is even. %C A233268 For all n, A218602(a(n)) = a(n) + (1-A000035(A213709(n-1))). %F A233268 a(n) = floor((A213710(n-1) + A218600(n)) / 2). %F A233268 a(n) = A218600(n-1) + ceiling((A213709(n-1)/2)). %o A233268 (MIT/GNU Scheme, two alternative versions) %o A233268 (define (A233268 n) (floor->exact (/ (+ (A213710 (- n 1)) (A218600 n)) 2))) %o A233268 (define (A233268 n) (+ (A218600 (- n 1)) (ceiling->exact (/ (A213709 (- n 1)) 2)))) %Y A233268 Cf. A213709, A213710, A218600, A234018, A234019, A234020. %Y A233268 Cf. also A179016, A218602, A218616, A233270, A233271. %K A233268 nonn %O A233268 1,2 %A A233268 _Antti Karttunen_, Dec 29 2013