[1,4,16,60,218,778,2744,9600,33391,115638,399137,1374050,4720272,16187632,55434424,189607406,647872199,2211794804,7545239986,25722676402,87641357150,298456587038,1015914399813,3456670564220,11757143968393,39976448714086,135887220346719]