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A146023 Triangle read by rows, square of A027293. 4

%I #19 Jun 15 2020 21:14:16

%S 1,2,1,5,2,1,10,5,2,1,20,10,5,2,1,36,20,10,5,2,1,65,36,20,10,5,2,1,

%T 110,65,36,20,10,5,2,1,185,110,65,36,20,10,5,2,1,300,185,110,65,36,20,

%U 10,5,2,1

%N Triangle read by rows, square of A027293.

%C Triangle, A000712 (1, 2, 5, 10, 20, 36,...) in every column.

%C Row sums = A000713: (1, 3, 8, 18, 38, 74, 139,...)

%C Note that we are working here in the world of lower triangular matrices. - _N. J. A. Sloane_, Jun 15 2020

%H Robert Price, <a href="/A146023/b146023.txt">Table of n, a(n) for n = 0..819</a> (first 40 rows}

%e First few rows of the triangle =

%e 1;

%e 2, 1;

%e 5, 2, 1;

%e 10, 5, 2, 1;

%e 20, 10, 5, 2, 1;

%e 36, 20, 10, 5, 2, 1;

%e 65, 36, 20, 10, 5, 2, 1;

%e 110, 65, 36, 20, 10, 5, 2, 1;

%e ...

%t lim = 10;

%t A000712 = Table [Length@IntegerPartitions[n, All, Range@n~Join~Range@n], {n, 0, lim - 1}]

%t Table[Reverse[Take[A000712, n]], {n, lim}] // Flatten (* _Robert Price_, Jun 15 2020 *)

%Y Cf. A000712, A000713, A027293.

%K nonn,tabl

%O 0,2

%A _Gary W. Adamson_, Oct 26 2008

%E Extraneous data deleted by _Robert Price_, Jun 15 2020

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Last modified April 25 09:38 EDT 2024. Contains 371967 sequences. (Running on oeis4.)