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Triangle read by rows, A054525 * A143308, 1<=k<=n.
1

%I #9 Jul 13 2023 08:17:53

%S 1,3,2,5,3,3,8,6,4,4,9,5,5,5,5,15,13,9,6,6,6,13,7,7,7,7,7,7,20,16,12,

%T 12,8,8,8,8,21,15,15,9,9,9,9,9,9,27,23,15,15,15,10,10,10,10,10,21,11,

%U 11,11,11,11,11,11,11,11,11,40,36,32,26,18,18,12,12,12,12,12,12,25,13,13,13,13,13,13,13,13,13,13,13,13

%N Triangle read by rows, A054525 * A143308, 1<=k<=n.

%C Row sums = A069097: (1, 5, 11, 22, 29, 55,...).

%C Left border = A018804: (1, 3, 5, 8, 9, 15,...).

%F Mobius transform of triangle A143308.

%e First few rows of the triangle =

%e 1;

%e 3, 2;

%e 5, 3, 3;

%e 8, 6, 4, 4;

%e 9, 5, 5, 5, 5;

%e 15, 13, 9, 6, 6, 6;

%e 13, 7, 7, 7, 7, 7, 7;

%e ...

%Y Cf. A018804, A069097, A143308.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Aug 06 2008

%E a(56) = 10 removed and more terms from _Georg Fischer_, Jul 13 2023