Number of 2 X 2 matrices M with all terms in {1,...,n} and permanent(M) >= n.

Terms

a(0) =0a(1) =1a(2) =16a(3) =80a(4) =251a(5) =612a(6) =1269a(7) =2354a(8) =4021a(9) =6449a(10) =9844a(11) =14427a(12) =20458a(13) =28203a(14) =37972a(15) =50073a(16) =64876a(17) =82725a(18) =104046a(19) =129222a(20) =158741a(21) =193024a(22) =232607a(23) =277956a(24) =329675a(25) =388248a(26) =454353a(27) =528508a(28) =611435a(29) =703712