A065224 - cp's OEIS frontend

A065224 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the octagonal numbers. The final elements of the rows form a(n).

%I A065224 #9 Nov 01 2024 15:08:42
%S A065224 1,2,5,1,6,12,19,6,15,25,36,8,21,35,50,1,18,36,55,75,96,22,45,69,94,
%T A065224 120,14,42,71,101,132,164,21,55,90,126,163,201,15,55,96,138,181,225,
%U A065224 270,36,83,131,180,230,281,333,45,99,154,210,267,325,384,36,97,159,222
%N A065224 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the octagonal numbers. The final elements of the rows form a(n).
%Y A065224 Cf. A000567.
%Y A065224 Mini-index to these sequences: A064766, A064865, A064866, A065221-A655234 are all of the same type. See A064766 for a detailed explanation.
%K A065224 easy,nonn
%O A065224 0,2
%A A065224 _Floor van Lamoen_, Oct 22 2001

cp's OEIS Frontend

A065224 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the octagonal numbers. The final elements of the rows form a(n).