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%I #6 Jan 09 2024 16:13:20
%S 1,32,456,1987,23456,321987,4567891,98765432,123456789,1987654321,
%T 23456789123,654321987654,7891234567891,65432198765432,
%U 789123456789123,1987654321987654,23456789123456789,987654321987654321
%N Let N = 123456789123456789123456789..., with the digits from 1 to 9 repeated indefinitely. Then a(n) is the n-digit number formed from the digits starting at the {n(n-1)/2 +1}-th position of N, read backwards if n is even.
%e a(3) = 456, the 3-digit number formed from the 4th digit onwards of N.
%e a(6) = 321987, the reversed 6-digit number formed from the 16th digit of N.
%K base,easy,nonn
%O 1,2
%A _Amarnath Murthy_, Dec 20 2001
%E More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 01 2003
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