Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
A253227
Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
Terms
- a(0) =335a(1) =742a(2) =914a(3) =1498a(4) =2543a(5) =4490a(6) =8216a(7) =15476a(8) =29780a(9) =58148a(10) =114620a(11) =227276a(12) =452276a(13) =901940a(14) =1800908a(15) =3598460a(16) =7193156a(17) =14382116a(18) =28759580a(19) =57514028a(20) =115022420a(21) =230038676a(22) =460070636a(23) =920133980a(24) =1840260068a(25) =3680511620a(26) =7361014076
External references
- oeis: A253227