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Half the number of non-self-intersecting paths from one corner of an n X n grid to the opposite corner.
0

%I #19 Dec 04 2018 23:28:46

%S 1,6,92,4256,631408,287890282,394680026626,1633299243490821,

%T 20522104351316248402,784379015232375006607050,

%U 91206645757124024620735442618,32264019671635009481678592579241059,34725332380760680832137350774453679498244

%N Half the number of non-self-intersecting paths from one corner of an n X n grid to the opposite corner.

%F a(n) = A007764(n) / 2. - _Andrew Howroyd_, May 12 2017

%Y Cf. A007764.

%K nonn,walk

%O 2,2

%A _Horst H. Manninger_, Jan 14 2000

%E Corrected, additional terms from A007764 by _Andrew Howroyd_, May 12 2017

%E Offset corrected by _Joerg Arndt_, Dec 03 2018