Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #11 Feb 14 2015 21:30:56
%S 0,1,3,2,6,5,4,11,10,9,8,7,20,19,18,17,16,15,14,13,12,36,35,34,33,32,
%T 31,30,29,28,27,26,25,24,23,22,21,65,64,63,62,61,60,59,58,57,56,55,54,
%U 53,52,51,50,49,48,47,46,45,44,43,42,41,40,39,38,37,118
%N Simple self-inverse permutation of natural numbers: after zero, list each block of A255071(n) numbers in reverse order, from A255061(n+1) to A255062(n).
%C Maps between A255056 and A255066. (Equally, between A255057 and A255067.)
%H Antti Karttunen, <a href="/A255122/b255122.txt">Table of n, a(n) for n = 0..721</a>
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F a(n) = A255061(1+A255121(n)) - A255120(n).
%o (Scheme) (define (A255122 n) (- (A255061 (+ 1 (A255121 n))) (A255120 n)))
%Y Cf. A255061, A255062, A255071, A255120, A255121.
%Y Cf. A255056, A255057, A255066, A255067.
%Y Similar permutations: A218602, A230432.
%K nonn
%O 0,3
%A _Antti Karttunen_, Feb 14 2015