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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).
0
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, 120, 14, 42, 71, 101, 132, 164, 21, 55, 90, 126, 163, 201, 15, 55, 96, 138, 181, 225, 270, 36, 83, 131, 180, 230, 281, 333, 45, 99, 154, 210, 267, 325, 384, 36, 97, 159, 222
OFFSET
0,2
CROSSREFS
Cf. A000567.
Mini-index to these sequences: A064766, A064865, A064866, A065221-A655234 are all of the same type. See A064766 for a detailed explanation.
Sequence in context: A238387 A084245 A174232 * A325137 A321966 A304822
KEYWORD
easy,nonn,changed
AUTHOR
Floor van Lamoen, Oct 22 2001
STATUS
approved