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A164342 Row sums of table A164341. 2
1, 4, 9, 27, 61, 185, 469, 1456, 4368, 14720, 50800, 190149, 735451, 3001161, 12659652, 55462967, 250186665, 1163114375, 5548002866, 27151477487, 135968479892, 696511087808, 3643182769117, 19449907766921, 105843172596610 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

T. Kyle Petersen and Bridget Eileen Tenner, How to write a permutation as a product of involutions (and why you might care), arXiv:1202.5319, 2012

CROSSREFS

Cf. A164341.

Sequence in context: A067758 A304677 A214418 * A034527 A329155 A111962

Adjacent sequences:  A164339 A164340 A164341 * A164343 A164344 A164345

KEYWORD

nonn

AUTHOR

Wouter Meeussen, Aug 13 2009

STATUS

approved

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Last modified November 15 01:25 EST 2019. Contains 329143 sequences. (Running on oeis4.)