Number of (n+1) X (1+1) 0..2 arrays colored with the upper median value of each 2 X 2 subblock.

A235947

Number of (n+1) X (1+1) 0..2 arrays colored with the upper median value of each 2 X 2 subblock.

Terms

    a(0) =81a(1) =294a(2) =905a(3) =2584a(4) =7353a(5) =20800a(6) =58896a(7) =167240a(8) =474948a(9) =1344000a(10) =3811120a(11) =10818624a(12) =30677136a(13) =86900480a(14) =246546816a(15) =699399552a(16) =1982514496a(17) =5620085760a(18) =15943384320a(19) =45209722880a(20) =128165455104a(21) =363441340416

External references