Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 filled by rows with each element moved a city block distance of 1 or 2, and rows and columns in increasing lexicographic order.
A263587
Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 filled by rows with each element moved a city block distance of 1 or 2, and rows and columns in increasing lexicographic order.
Terms
- a(0) =1a(1) =6a(2) =12a(3) =31a(4) =89a(5) =230a(6) =536a(7) =1171a(8) =2439a(9) =4882a(10) =9470a(11) =17935a(12) =33331a(13) =60994a(14) =110208a(15) =197059a(16) =349285a(17) =614522a(18) =1074316a(19) =1867855a(20) =3232059a(21) =5569206a(22) =9560842a(23) =16359331a(24) =27909479a(25) =47487870a(26) =80606196a(27) =136522471a(28) =230766449a(29) =389355662
External references
- oeis: A263587