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A127701 Infinite lower triangular matrix with (1, 2, 3, ...) in the main diagonal, (1, 1, 1, ...) in the subdiagonal and the rest zeros. 17

%I #12 Jun 05 2021 01:37:58

%S 1,1,2,0,1,3,0,0,1,4,0,0,0,1,5,0,0,0,0,1,6,0,0,0,0,0,1,7,0,0,0,0,0,0,

%T 1,8,0,0,0,0,0,0,0,1,9,0,0,0,0,0,0,0,0,1,10,0,0,0,0,0,0,0,0,0,1,11,0,

%U 0,0,0,0,0,0,0,0,0,1,12,0,0,0,0,0,0,0,0,0,0,0,1,13,0,0,0,0,0,0,0,0,0,0,0,0

%N Infinite lower triangular matrix with (1, 2, 3, ...) in the main diagonal, (1, 1, 1, ...) in the subdiagonal and the rest zeros.

%C Eigensequence of the triangle = A001040 starting (1, 3, 10, 43, 225, ...). - _Gary W. Adamson_, Dec 29 2008

%e First few rows of the triangle are:

%e 1;

%e 1, 2;

%e 0, 1, 3;

%e 0, 0, 1, 4;

%e 0, 0, 0, 1, 5;

%e 0, 0, 0, 0, 1, 6;

%e 0, 0, 0, 0, 0, 1, 7;

%e ...

%t Join[{1},Flatten[Table[Join[{PadRight[{},n-2,0],1,n}],{n,2,15}]]] (* _Harvey P. Dale_, Jan 06 2014 *)

%Y Cf. A001040. - _Gary W. Adamson_, Dec 29 2008

%K nonn,easy,tabl

%O 1,3

%A _Gary W. Adamson_, Jan 23 2007

%E More terms from _Jon E. Schoenfield_, May 26 2007

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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)