Number of (n+1)X2 0..3 arrays with the permanents of all 2X2 subblocks equal and nonzero.
A204869
Number of (n+1)X2 0..3 arrays with the permanents of all 2X2 subblocks equal and nonzero.
Terms
- a(0) =207a(1) =551a(2) =1467a(3) =4245a(4) =12241a(5) =36285a(6) =107397a(7) =321317a(8) =961553a(9) =2892495a(10) =8709757a(11) =26307557a(12) =79561225a(13) =241132539a(14) =731760333a(15) =2224348229a(16) =6769653545a(17) =20631078401a(18) =62945318613a(19) =192268398395a(20) =587883672713
External references
- oeis: A204869