

A294847


a(n) is the total number of line segments in the diagram described in A236104 after nth stage, with a(0) = 2.


4



2, 4, 6, 8, 12, 14, 20, 22, 28, 32, 38, 40, 48, 50, 56, 64, 74, 76, 86, 88, 98, 106, 112, 114, 126, 132, 138, 146, 160, 162
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OFFSET

0,1


COMMENTS

Note that the diagram is also the top view of the stepped pyramid with n levels described in A245092.
For the construction of the diagram using Dyck paths and for more information about the pyramid see A237593.


LINKS



EXAMPLE

Illustration of initial terms (n = 1..6):
. _ _ _ _
. _ _ _ _ _ _ _
. _ _ _ _ _ _ _ _ _ _
. _ _ _ _ _ _ _ _ _ _ _ _ _ 
. _ _ _ __ _ __  _ __   _ __   
. _ _  _   _    _     _     
. _ __ ___ ____ _____ ______
.
. 4 6 8 12 14 20


CROSSREFS

Cf. A000203, A024916, A196020, A235791, A236104, A237048, A237270, A237271, A237590, A237591, A237593, A245092, A262626, A294723.


KEYWORD

nonn,more


AUTHOR



STATUS

approved



