login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A207074 Number of 7Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically 1
14, 196, 966, 4536, 24304, 111426, 468348, 1992996, 8204200, 32364700, 126207438, 485459784, 1829249768, 6809144730, 25110435922, 91539487000, 330608108182, 1185426647902, 4218712592850, 14911669509057, 52409625818926 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A207068

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 13*a(n-1) -77*a(n-2) +383*a(n-3) -1936*a(n-4) +7922*a(n-5) -28256*a(n-6) +103017*a(n-7) -335295*a(n-8) +972967*a(n-9) -2898437*a(n-10) +7966108*a(n-11) -19695289*a(n-12) +50590479*a(n-13) -121311483*a(n-14) +261567751*a(n-15) -598810479*a(n-16) +1278613877*a(n-17) -2435180257*a(n-18) +5103796480*a(n-19) -9830453100*a(n-20) +16639266482*a(n-21) -32810735226*a(n-22) +57338491218*a(n-23) -86327093442*a(n-24) +165368021800*a(n-25) -261215742290*a(n-26) +348609720526*a(n-27) -675060737155*a(n-28) +947076002811*a(n-29) -1114104267547*a(n-30) +2291266909445*a(n-31) -2752950138758*a(n-32) +2846776029030*a(n-33) -6591178122692*a(n-34) +6378804191029*a(n-35) -5860717529743*a(n-36) +16246332680119*a(n-37) -11492394343561*a(n-38) +9831250373548*a(n-39) -34372580178341*a(n-40) +15047096292563*a(n-41) -13775536083585*a(n-42) +62011759601185*a(n-43) -11209722202073*a(n-44) +16941038227703*a(n-45) -94239166030921*a(n-46) -4304990908984*a(n-47) -19443731342848*a(n-48) +118797207702512*a(n-49) +27461057092152*a(n-50) +21121113946208*a(n-51) -122114528749824*a(n-52) -45290805108400*a(n-53) -20290807770736*a(n-54) +100417788663552*a(n-55) +46418065916544*a(n-56) +15492754380096*a(n-57) -64466394516288*a(n-58) -32418504516096*a(n-59) -8453846568960*a(n-60) +31216358866176*a(n-61) +15231769369344*a(n-62) +2924248780800*a(n-63) -10776946268160*a(n-64) -4459567104000*a(n-65) -474099609600*a(n-66) +2364899328000*a(n-67) +658409472000*a(n-68) -268738560000*a(n-70)

EXAMPLE

Some solutions for n=4

..1..0..1..1....0..0..0..0....1..0..0..0....0..1..1..1....0..1..1..1

..1..0..0..0....1..0..0..0....1..0..0..0....1..1..0..0....1..1..1..1

..1..0..0..0....1..0..0..0....0..0..0..0....1..1..0..0....1..1..1..1

..0..0..0..0....0..0..0..0....0..0..0..0....1..0..0..0....1..1..1..1

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....1..1..1..1

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..1..1..1

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..1..1..0

CROSSREFS

Sequence in context: A207963 A207502 A209654 * A207407 A207708 A207253

Adjacent sequences:  A207071 A207072 A207073 * A207075 A207076 A207077

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 19 21:31 EST 2022. Contains 350466 sequences. (Running on oeis4.)