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A158948 Triangle read by rows, left border = natural numbers repeated (1, 1, 2, 2, 3, 3, ...); all other columns = (1, 0, 1, 0, 1, 0, ...). 2

%I #8 Feb 08 2022 23:12:11

%S 1,1,1,2,0,1,2,1,0,1,3,0,1,0,1,3,1,0,1,0,1,4,0,1,0,1,0,1,4,1,0,1,0,1,

%T 0,1,5,0,1,0,1,0,1,0,1,5,1,0,1,0,1,0,1,0,1

%N Triangle read by rows, left border = natural numbers repeated (1, 1, 2, 2, 3, 3, ...); all other columns = (1, 0, 1, 0, 1, 0, ...).

%C Row sums = n. Eigensequence of the triangle = nonzero terms of A000071: (1, 2, 4, 7, 12, 20, ...) = ((F3 - 1), (F4 - 1), (F5 - 1), ...).

%F Triangle by rows, left border = natural numbers repeated (1, 1, 2, 2, 3, 3, ...); all other columns = (1, 0, 1, 0, 1, 0, ...).

%e First few rows of the triangle:

%e 1;

%e 1, 1;

%e 2, 0, 1;

%e 2, 1, 0, 1;

%e 3, 0, 1, 0, 1;

%e 3, 1, 0, 1, 0, 1;

%e 4, 0, 1, 0, 1, 0, 1;

%e 4, 1, 0, 1, 0, 1, 0, 1;

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

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

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

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

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

%e ...

%Y Cf. A000071.

%K nonn,tabf

%O 1,4

%A _Gary W. Adamson_, Mar 31 2009

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)