A180765 Half the number of nX5 binary arrays with each element equal to at least one neighbor

3, 111, 2385, 52186, 1154119, 25448809, 561487456, 12387396391, 273289411333, 6029284136868, 133017439433103, 2934617106201383, 64743220889823228, 1428358285117311045, 31512293679807784965, 695220984328633501278

Offset

1,1

Comments

Column 5 of A180771

Links

R. H. Hardin, Table of n, a(n) for n=1..199

Formula

Empirical: a(n) = 17*a(n-1) + 136*a(n-2) - 345*a(n-3) - 4373*a(n-4) + 71*a(n-5) + 66879*a(n-6) + 73663*a(n-7) - 605750*a(n-8) - 1149380*a(n-9) + 3440076*a(n-10) + 9495118*a(n-11) - 11523196*a(n-12) - 49881727*a(n-13) + 14883216*a(n-14) + 170573727*a(n-15) + 56476212*a(n-16) - 384039937*a(n-17) - 365812542*a(n-18) + 600541982*a(n-19) + 912782329*a(n-20) - 647992787*a(n-21) - 1217873627*a(n-22) + 831099316*a(n-23) + 509861969*a(n-24) - 535317645*a(n-25) - 243113473*a(n-26) + 146477582*a(n-27) + 239475023*a(n-28) - 56646215*a(n-29) - 153066695*a(n-30) + 13721643*a(n-31) + 55901473*a(n-32) + 8739700*a(n-33) - 17235985*a(n-34) - 7556526*a(n-35) + 4435220*a(n-36) + 2967912*a(n-37) - 742411*a(n-38) - 903018*a(n-39) + 68146*a(n-40) + 206458*a(n-41) + 20454*a(n-42) - 27768*a(n-43) - 10964*a(n-44) + 1696*a(n-45) + 1408*a(n-46)

Crossrefs

Sequence in context: A114738 A111091 A301612 * A232769 A066138 A114207

Adjacent sequences: A180762 A180763 A180764 * A180766 A180767 A180768

Keyword

nonn

Author

R. H. Hardin Sep 20 2010

Status

approved