Number of (n+1) X (7+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

A251148

Number of (n+1) X (7+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

Terms

    a(0) =853a(1) =1075a(2) =1413a(3) =1987a(4) =2925a(5) =4491a(6) =7101a(7) =11491a(8) =18917a(9) =31587a(10) =53389a(11) =91275a(12) =157789a(13) =275843a(14) =487717a(15) =872259a(16) =1577901a(17) =2886539a(18) =5337725a(19) =9971363a(20) =18803813a(21) =35765155a(22) =68549453a(23) =132276107a(24) =256749085a(25) =500872771a(26) =981317541a(27) =1929582211a(28) =3805684077

External references