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After the first zero, integers from 0 to A213709(n)-1 followed by integers from 0 to A213709(n+1)-1, etc.
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%I #6 Nov 10 2012 20:48:33

%S 0,0,0,0,1,0,1,2,0,1,2,3,4,0,1,2,3,4,5,6,7,8,0,1,2,3,4,5,6,7,8,9,10,

%T 11,12,13,14,15,16,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,

%U 20,21,22,23,24,25,26,27,28,29,0

%N After the first zero, integers from 0 to A213709(n)-1 followed by integers from 0 to A213709(n+1)-1, etc.

%H Antti Karttunen, <a href="/A218601/b218601.txt">Table of n, a(n) for n = 0..8727</a>

%F a(0)=0, and for n>0, a(n) = (n-A218600(A213711(n)-1))-1.

%o (Scheme): (define (A218601 n) (if (zero? n) n (-1+ (- n (A218600 (-1+ (A213711 n)))))))

%Y Needed for A218602. Cf. also A218599, A053645, A082853, A002262.

%K nonn

%O 0,8

%A _Antti Karttunen_, Nov 10 2012