Number of n X 3 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.

A301536

Number of n X 3 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =6a(2) =9a(3) =26a(4) =61a(5) =154a(6) =374a(7) =941a(8) =2357a(9) =5963a(10) =15074a(11) =38168a(12) =96641a(13) =244836a(14) =620311a(15) =1571854a(16) =3983147a(17) =10093850a(18) =25579490a(19) =64823479a(20) =164276135a(21) =416311227a(22) =1055023990a(23) =2673664936a(24) =6775663297a(25) =17171047596a(26) =43515284891a(27) =110277499816

External references