a(n) = P_n(-1), where P_n(x) is a certain polynomial arising in the enumeration of tatami mat coverings.

A226302

a(n) = P_n(-1), where P_n(x) is a certain polynomial arising in the enumeration of tatami mat coverings.

Terms

    a(0) =1a(1) =-1a(2) =2a(3) =-4a(4) =6a(5) =-14a(6) =20a(7) =-48a(8) =70a(9) =-166a(10) =252a(11) =-584a(12) =924a(13) =-2092a(14) =3432a(15) =-7616a(16) =12870a(17) =-28102a(18) =48620a(19) =-104824a(20) =184756a(21) =-394404a(22) =705432a(23) =-1494240a(24) =2704156a(25) =-5692636a(26) =10400600a(27) =-21785872a(28) =40116600a(29) =-83688344

External references