a(n) = sum of absolute values of coefficients of a certain polynomial P_n(x) arising in the enumeration of tatami mat coverings.

A226303

a(n) = sum of absolute values of coefficients of a certain polynomial P_n(x) arising in the enumeration of tatami mat coverings.

Terms

    a(0) =1a(1) =3a(2) =4a(3) =10a(4) =10a(5) =22a(6) =28a(7) =64a(8) =76a(9) =180a(10) =260a(11) =606a(12) =932a(13) =2124a(14) =3440a(15) =7666a(16) =12872a(17) =28178a(18) =48620a(19) =104946a(20) =184756a(21) =394638a(22) =705432a(23) =1494600a(24) =2704156a(25) =5693376a(26) =10400600

External references