Number of Hamiltonian paths in the n-flower graph.

Terms

a(0) =48a(1) =192a(2) =696a(3) =1780a(4) =4824a(5) =11368a(6) =27552a(7) =62064a(8) =141840a(9) =312224a(10) =690768a(11) =1496768a(12) =3246096a(13) =6956160a(14) =14890944a(15) =31643392a(16) =67124592a(17) =141707776a(18) =298588080a(19) =627035136a(20) =1314350928a(21) =2748188672a(22) =5736578976a(23) =11951206400a(24) =24861171504a(25) =51634741248a(26) =107100012432