A209740 Number of nX4 0..5 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..5 introduced in row major order.
15, 700, 103373, 20611956, 4474325828, 991613495404, 220845828478730, 49242046909442868, 10982471712866182098, 2449579228342732267816, 546373088082223670747386, 121867698385924682716244064
Offset: 1
Keywords
Examples
Some solutions for n=5 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..1..0....0..0..0..0 ..1..2..3..2....1..2..1..2....1..2..1..2....1..2..0..2....1..2..1..2 ..4..1..1..1....0..0..2..3....0..1..3..3....0..1..2..3....0..0..0..2 ..4..3..4..0....1..2..1..1....3..0..0..1....4..4..1..1....3..1..2..4 ..5..4..5..0....4..4..4..2....0..4..1..4....5..3..3..2....5..3..1..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Formula
Empirical: a(n) = 244*a(n-1) +137*a(n-2) -1195614*a(n-3) +21837944*a(n-4) +1404675270*a(n-5) -36835307408*a(n-6) -326873376252*a(n-7) +14507648154376*a(n-8) -8311682181464*a(n-9) -2334523810998832*a(n-10) +8762975100490480*a(n-11) +185277092995650336*a(n-12) -908553103605691712*a(n-13) -8222060623354335360*a(n-14) +40603092591766507264*a(n-15) +222543140644632005632*a(n-16) -906919532901077344256*a(n-17) -3774725396673218404352*a(n-18) +10011737555551519784960*a(n-19) +37478635910651820179456*a(n-20) -48928099712667888910336*a(n-21) -182050232765906369380352*a(n-22) +115193182556326721486848*a(n-23) +411251029796589926350848*a(n-24) -170990851031162490454016*a(n-25) -418387866292483163947008*a(n-26) +167007575033595637530624*a(n-27) +154943201526404521918464*a(n-28) -70873530141897822044160*a(n-29) for n>30
Comments