Number of n X 3 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.

A209369

Number of n X 3 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.

Terms

    a(0) =19a(1) =84a(2) =115a(3) =242a(4) =690a(5) =1922a(6) =5460a(7) =15488a(8) =43792a(9) =124002a(10) =351154a(11) =994050a(12) =2814300a(13) =7968032a(14) =22558752a(15) =63867602a(16) =180820962a(17) =511936002a(18) =1449380900a(19) =4103455232a(20) =11617609120a(21) =32891508162a(22) =93121689570a(23) =263644006658a(24) =746422898732

External references