Number of squares in all tilings of a 4 X n rectangle using integer-sided square tiles.

A226547

Number of squares in all tilings of a 4 X n rectangle using integer-sided square tiles.

Terms

    a(0) =0a(1) =4a(2) =25a(3) =98a(4) =386a(5) =1402a(6) =4938a(7) =16936a(8) =57020a(9) =189172a(10) =620397a(11) =2015456a(12) =6496391a(13) =20801576a(14) =66231279a(15) =209847980a(16) =662049349a(17) =2080850248a(18) =6518383898a(19) =20358327362a(20) =63413001935a(21) =197042859318a(22) =610922240964

External references