cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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.

Original entry on oeis.org

15, 700, 103373, 20611956, 4474325828, 991613495404, 220845828478730, 49242046909442868, 10982471712866182098, 2449579228342732267816, 546373088082223670747386, 121867698385924682716244064
Offset: 1

Views

Author

R. H. Hardin Mar 12 2012

Keywords

Comments

Column 4 of A209744

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
		

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