Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #10 Jul 08 2012 14:41:06
%S 1,4,9,27,61,185,469,1456,4368,14720,50800,190149,735451,3001161,
%T 12659652,55462967,250186665,1163114375,5548002866,27151477487,
%U 135968479892,696511087808,3643182769117,19449907766921,105843172596610
%N Row sums of table A164341.
%H T. Kyle Petersen and Bridget Eileen Tenner, <a href="http://arxiv.org/abs/1202.5319">How to write a permutation as a product of involutions (and why you might care)</a>, arXiv:1202.5319, 2012
%Y Cf. A164341.
%K nonn
%O 1,2
%A _Wouter Meeussen_, Aug 13 2009