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A290866 a(n) = number of segments (edges) in the configuration A290447(n). 5
0, 1, 3, 8, 20, 45, 91, 168, 285, 450, 670, 981, 1375, 1902, 2568, 3371, 4326, 5522, 6927, 8639, 10624, 12882, 15489, 18559, 22006, 25904, 30321, 35254, 40728, 46959, 53721, 61354, 69734, 78917, 89029, 100018, 111758, 124759, 138943 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

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

LINKS

David Applegate, Table of n, a(n) for n = 1..100

FORMULA

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

CROSSREFS

Cf. A290447, A290865, A290867.

Sequence in context: A192982 A096585 A057765 * A014628 A134393 A034504

Adjacent sequences:  A290863 A290864 A290865 * A290867 A290868 A290869

KEYWORD

nonn

AUTHOR

David Applegate, Aug 12 2017

STATUS

approved

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Last modified January 21 20:28 EST 2022. Contains 350480 sequences. (Running on oeis4.)