Number of 4 X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.

A229447

Number of 4 X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.

Terms

    a(0) =12a(1) =25a(2) =53a(3) =109a(4) =212a(5) =387a(6) =665a(7) =1083a(8) =1684a(9) =2517a(10) =3637a(11) =5105a(12) =6988a(13) =9359a(14) =12297a(15) =15887a(16) =20220a(17) =25393a(18) =31509a(19) =38677a(20) =47012a(21) =56635a(22) =67673a(23) =80259a(24) =94532a(25) =110637a(26) =128725a(27) =148953a(28) =171484a(29) =196487

External references