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A065222 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 hexagonal numbers. The final elements of the rows form a(n).

%I A065222 #7 Nov 01 2024 15:02:19
%S A065222 1,2,5,3,8,14,6,14,23,5,16,28,41,10,25,41,58,10,29,49,70,1,24,48,73,
%T A065222 99,6,34,63,93,124,3,36,70,105,141,178,26,65,105,146,188,231,44,89,
%U A065222 135,182,230,3,53,104,156,209,263,318,49,106,164,223,283,344,28,91,155,220
%N A065222 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 hexagonal numbers. The final elements of the rows form a(n).
%e A065222 The array begins
%e A065222 ....1
%e A065222 ...1.2
%e A065222 ..3.4.5
%e A065222 .6.1.2.3
%e A065222 4.5.6.7.8
%Y A065222 Cf. A000384.
%Y A065222 Mini-index to these sequences: A064766, A064865, A064866, A065221-A655234 are all of the same type. See A064766 for a detailed explanation.
%K A065222 easy,nonn
%O A065222 0,2
%A A065222 _Floor van Lamoen_, Oct 22 2001