A290866 - OEIS

%I #12 Feb 19 2020 22:34:13

%S 0,1,3,8,20,45,91,168,285,450,670,981,1375,1902,2568,3371,4326,5522,

%T 6927,8639,10624,12882,15489,18559,22006,25904,30321,35254,40728,

%U 46959,53721,61354,69734,78917,89029,100018,111758,124759,138943

%N a(n) = number of segments (edges) in the configuration A290447(n).

%C Only edges above the line are counted. Total edges = a(n) + n - 1.

%H David Applegate, <a href="/A290866/b290866.txt">Table of n, a(n) for n = 1..100</a>

%F a(n) = A290447(n) + A290865(n).

%Y Cf. A290447, A290865, A290867.

%K nonn

%O 1,3

%A _David Applegate_, Aug 12 2017