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A052144 A000172(n)^2. 3
1, 4, 100, 3136, 119716, 5071504, 230553856, 11016601600, 546360462244, 27888242788624, 1456587070867600, 77515424509446400, 4189899499315360000, 229472379264509977600, 12709952101698593689600, 710863065714510068187136 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see page 191.

LINKS

Table of n, a(n) for n=0..15.

CROSSREFS

Sequence in context: A029995 A244352 A173987 * A165518 A127776 A266524

Adjacent sequences:  A052141 A052142 A052143 * A052145 A052146 A052147

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 23 2000

STATUS

approved

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Last modified November 16 00:11 EST 2018. Contains 317252 sequences. (Running on oeis4.)