A164342 Row sums of table A164341.

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

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: A357752 A304677 A214418 * A034527 A329155 A111962

Adjacent sequences: A164339 A164340 A164341 * A164343 A164344 A164345

Keyword

nonn

Author

Wouter Meeussen, Aug 13 2009

Status

approved