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A036654
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Triangle of series-parallel numbers.
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1
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1, 1, 1, 2, 2, 2, 4, 6, 8, 8, 10, 18, 34, 52, 52, 24, 58, 136, 288, 472, 472, 66, 186, 538, 1424, 3224, 5504, 5504, 180, 614, 2080, 6648, 18888, 44712, 78416, 78416, 522, 2034, 7970, 29700, 101340, 302096, 738448, 1320064, 1320064
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,4
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REFERENCES
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J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 142.
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LINKS
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Table of n, a(n) for n=0..44.
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EXAMPLE
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Triangle begins
1;
1, 1;
2, 2, 2;
4, 6, 8, 8;
...
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CROSSREFS
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Sequence in context: A341095 A090858 A187504 * A262669 A345256 A291299
Adjacent sequences: A036651 A036652 A036653 * A036655 A036656 A036657
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KEYWORD
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nonn,easy,tabl,nice
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AUTHOR
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N. J. A. Sloane
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EXTENSIONS
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a(35) corrected by Sean A. Irvine, Nov 15 2020
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STATUS
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approved
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