Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
A258548
Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
Terms
- a(0) =44a(1) =112a(2) =296a(3) =652a(4) =1329a(5) =2530a(6) =4667a(7) =8419a(8) =14932a(9) =26184a(10) =45561a(11) =78903a(12) =136170a(13) =234461a(14) =403075a(15) =692272a(16) =1188185a(17) =2038466a(18) =3496239a(19) =5995441a(20) =10279967a(21) =17625041a(22) =30216773a(23) =51802782a(24) =88807568a(25) =152244537a(26) =260993810a(27) =447421309a(28) =767011467
External references
- oeis: A258548