Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.

A220705

Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.

Terms

    a(0) =1a(1) =5a(2) =12a(3) =37a(4) =107a(5) =317a(6) =932a(7) =2749a(8) =8101a(9) =23881a(10) =70392a(11) =207497a(12) =611639a(13) =1802937a(14) =5314536a(15) =15665721a(16) =46178025a(17) =136119501a(18) =401241028a(19) =1182742829a(20) =3486384739a(21) =10276856693a(22) =30293209548a(23) =89295644789a(24) =263217806797a(25) =775890178961

External references