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a(n) = n-th element of n-th row of triangle shown below.
1

%I #8 Feb 26 2015 09:32:08

%S 1,2,2,7,3,21,25,113,17,289,321,1665,769,5633,7169,30721,2049,69633,

%T 73729,409601,163841,1376257,1703937,7602177,1572865,19922945,

%U 23068673,113246209,58720257,385875969,503316481,2080374785,67108865,4429185025,4563402753

%N a(n) = n-th element of n-th row of triangle shown below.

%C 1

%C 1..............................................2

%C 1......................3.......................2.......................4

%C 1...........5..........3...........7...........2...........6...........4...........8

%C 1.....9.....5....13....3....11.....7....15.....2....10.....6....14.....4....12.....8....16

%C 1.17..9.25..5.21.13.29.3.19.11.27..7.23.15.31..2.18.10.26..6.22.14.30..4.20.12.28..8.24.16.32

%C ...

%H Alois P. Heinz, <a href="/A115025/b115025.txt">Table of n, a(n) for n = 1..1000</a>

%Y Cf. A049773.

%K nonn

%O 1,2

%A _Jonas Wallgren_, Feb 24 2006

%E Offset changed to 1 by _Alois P. Heinz_, Feb 26 2015

%E a(16)-a(35) from _Alois P. Heinz_, Feb 26 2015