A260838 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.
644, 796, 1560, 2590, 3828, 8646, 16000, 24508, 49816, 103124, 168848, 309802, 649200, 1162556, 2036072, 4109542, 7787612, 13696344, 26404180, 51320598, 92306500, 172258250, 335370864, 618838306, 1136886200, 2187906876, 4116117684
Offset: 1
Keywords
Examples
Some solutions for n=4 ..1..0..0..0..0..0..1....0..0..1..0..0..1..1....1..0..0..0..1..0..0 ..0..0..0..1..0..0..0....0..0..1..0..0..1..0....1..1..0..0..1..0..0 ..0..0..0..1..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0 ..1..0..0..0..0..0..1....0..0..0..0..0..0..0....0..0..0..0..0..0..0 ..0..0..0..0..0..0..1....1..1..0..0..1..0..0....1..0..0..1..0..0..1 ..1..0..1..1..0..0..0....0..0..0..0..1..0..0....1..0..0..1..0..0..0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Crossrefs
Cf. A260841
Formula
Empirical: a(n) = a(n-1) -a(n-2) +9*a(n-3) +6*a(n-4) -6*a(n-5) -16*a(n-6) -76*a(n-7) -21*a(n-8) +49*a(n-9) +157*a(n-10) +285*a(n-11) +73*a(n-12) -293*a(n-13) -493*a(n-14) -729*a(n-15) -129*a(n-16) +827*a(n-17) +816*a(n-18) +1268*a(n-19) +240*a(n-20) -1378*a(n-21) -504*a(n-22) -1772*a(n-23) -458*a(n-24) +1328*a(n-25) -281*a(n-26) +1801*a(n-27) +864*a(n-28) -856*a(n-29) +1053*a(n-30) -799*a(n-31) -958*a(n-32) +266*a(n-33) -1759*a(n-34) -689*a(n-35) -190*a(n-36) +1158*a(n-37) +925*a(n-38) +2065*a(n-39) +1168*a(n-40) -1992*a(n-41) +631*a(n-42) -2275*a(n-43) -927*a(n-44) +1309*a(n-45) -893*a(n-46) +1275*a(n-47) +371*a(n-48) -451*a(n-49) +409*a(n-50) -375*a(n-51) -87*a(n-52) +87*a(n-53) -93*a(n-54) +57*a(n-55) +7*a(n-56) -7*a(n-57) +7*a(n-58) -3*a(n-59) for n>63
Comments