Number of inequivalent (modulo C_4 rotations) square n X n grids with squares coming in two colors and four squares have one of the colors.

A277226

Number of inequivalent (modulo C_4 rotations) square n X n grids with squares coming in two colors and four squares have one of the colors.

Terms

    a(0) =1a(1) =34a(2) =464a(3) =3182a(4) =14769a(5) =53044a(6) =158976a(7) =416140a(8) =980625a(9) =2124310a(10) =4295376a(11) =8199674a(12) =14907809a(13) =25992232a(14) =43700224a(15) =71167704a(16) =112680801a(17) =173990730a(18) =262690000a(19) =388656070a(20) =564571601a(21) =806527964a(22) =1134722304a(23) =1574255332a(24) =2156041329a(25) =2917838014a(26) =3905408976a(27) =5173826770a(28) =6788930625

External references