cp's OEIS Frontend

A143315 Triangle read by rows: T(n, k) = 2*A126988(n, k) - signum(A126988(n, k)).

%I A143315 #8 Jun 08 2023 04:44:26
%S A143315 1,3,1,5,0,1,7,3,0,1,9,0,0,0,1,11,5,3,0,0,1,13,0,0,0,0,0,1,15,7,0,3,0,
%T A143315 0,0,1,17,0,5,0,0,0,0,0,1,19,9,0,0,3,0,0,0,0,1,21,0,0,0,0,0,0,0,0,0,1,
%U A143315 23,11,7,5,0,3,0,0,0,0,0,1,25,0,0,0,0,0,0,0,0,0,0,0,1
%N A143315 Triangle read by rows: T(n, k) = 2*A126988(n, k) - signum(A126988(n, k)).
%C A143315 Row sums = A129235: (1, 4, 6, 11, 10, 20, 14,...).
%F A143315 By columns, replace the 1's in A051731 in succession with (1, 3, 5, 7,...).
%e A143315 First few rows of the triangle:
%e A143315    1;
%e A143315    3, 1;
%e A143315    5, 0, 1;
%e A143315    7, 3, 0, 1;
%e A143315    9, 0, 0, 0, 1;
%e A143315   11, 5, 3, 0, 0, 1;
%e A143315   13, 0, 0, 0, 0, 0, 1;
%e A143315   15, 7, 0, 3, 0, 0, 0, 1;
%e A143315   ...
%Y A143315 Cf. A051731, A126988, A129235.
%K A143315 nonn,tabl
%O A143315 1,2
%A A143315 _Gary W. Adamson_, Aug 06 2008
%E A143315 Definition corrected and a(50) split by _Georg Fischer_, Jun 08 2023