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A036654 Triangle of series-parallel numbers. 1
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, 78616, 522, 2034, 7970, 29700, 101340, 302096, 738448, 1320064, 1320064 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 142.

LINKS

Table of n, a(n) for n=0..44.

EXAMPLE

1; 1 1; 2 2 2; 4 6 8 8;...

CROSSREFS

Sequence in context: A093393 A090858 A187504 * A262669 A291299 A241576

Adjacent sequences:  A036651 A036652 A036653 * A036655 A036656 A036657

KEYWORD

nonn,easy,tabl,nice

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 23 23:56 EST 2018. Contains 299595 sequences. (Running on oeis4.)