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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 first elements of the rows form a(n).
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%I #5 Nov 01 2024 15:05:30

%S 1,1,3,6,2,7,13,20,7,16,26,37,9,22,36,51,2,19,37,56,76,1,23,46,70,95,

%T 121,15,43,72,102,133,165,22,56,91,127,164,202,16,56,97,139,182,226,

%U 271,37,84,132,181,231,282,334,46,100,155,211,268,326,385,37,98,160

%N 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 first elements of the rows form a(n).

%Y Mini-index to these sequences: A064766, A064865, A064866, A065221-A655234 are all of the same type. See A064766 for a detailed explanation.

%K easy,nonn

%O 0,3

%A _Floor van Lamoen_, Oct 22 2001