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(s(n)+s(n+1))/18, where s()=A006521.
0

%I #6 Jan 27 2022 22:22:30

%S 2,6,14,23,42,69,126,207,302,437,621,906,1275,1503,1863,2718,3825,

%T 4509,5589,6710,8303,10298,12026,13527,16767,20130,24225,28557,30894,

%U 35970,39501,40581,50301

%N (s(n)+s(n+1))/18, where s()=A006521.

%Y Cf. A006521.

%K nonn

%O 3,1

%A _Robert G. Wilson v_