A283110 Increase in the number of fixed polyominoes from order n to order n+1.

0, 1, 4, 13, 44, 153, 544, 1965, 7185, 26536, 98822, 370593, 1398029, 5300984, 20189792, 77198271, 296202907, 1140024698, 4399918134, 17024040984, 66018733123, 256549059895, 998839762846, 3895616434744, 15217813245743, 59534874351097, 233231355731136, 914864639728729

Offset: 0

Author

Francois Alcover, Feb 28 2017

Keywords

• nonn

Links

• John Mason, Table of n, a(n) for n = 0..55

Crossrefs

Cf. A001168.

Formula

a(n) = A001168(n+1) - A001168(n); this holds for n=0 if A001168(0) is set conventionally to 1, like it is done for free polyominoes in A000105. We say there are exactly 1 fixed polyominoes of order 0.