Number of nX2 1..4 arrays containing at least one of each value, and all equal values connected.

A166757

Number of nX2 1..4 arrays containing at least one of each value, and all equal values connected.

Terms

    a(0) =0a(1) =24a(2) =504a(3) =3672a(4) =16272a(5) =53784a(6) =146184a(7) =345240a(8) =733344a(9) =1433880a(10) =2623128a(11) =4543704a(12) =7519536a(13) =11972376a(14) =18439848a(15) =27595032a(16) =40267584a(17) =57466392a(18) =80403768a(19) =110521176a(20) =149516496a(21) =199372824a(22) =262388808a(23) =341210520a(24) =438864864a(25) =558794520a(26) =704894424

External references