Number of nX2 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.

A278849

Number of nX2 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =25a(4) =239a(5) =1486a(6) =7072a(7) =27828a(8) =94720a(9) =287298a(10) =793024a(11) =2023332a(12) =4828941a(13) =10881820a(14) =23327332a(15) =47861324a(16) =94458120a(17) =180072500a(18) =332769135a(19) =597905471a(20) =1047219371a(21) =1791963626a(22) =3001600740a(23) =4930040800a(24) =7951993320a(25) =12612734550

External references