The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A227383 Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order 1
 5, 30, 185, 1104, 6160, 31073, 141192, 581706, 2192737, 7631150, 24723499, 75114814, 215382006, 586096131, 1520882101, 3779307010, 9026380556, 20787492011, 46293089506, 99943655427, 209652253128, 428180495383 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A227385 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = (1/2534272925184000)*n^19 + (23/800296713216000)*n^18 + (31/29640619008000)*n^17 + (1061/31384184832000)*n^16 + (1/1793792000)*n^15 + (901/89159616000)*n^14 + (573137/7846046208000)*n^13 + (19320181/3621252096000)*n^12 - (25008281/201180672000)*n^11 + (332913253/109734912000)*n^10 - (5757514877/134120448000)*n^9 + (1008987604001/2414168064000)*n^8 - (7198243864451/3923023104000)*n^7 - (144244343741471/11769069312000)*n^6 + (12251347161947/40864824000)*n^5 - (164980284780767/59439744000)*n^4 + (28073158072/1786785)*n^3 - (35127268025713/617512896)*n^2 + (14284038375031/116396280)*n - 121172 for n>7 EXAMPLE Some solutions for n=4 ..0..1..0..0....1..0..0..0....0..1..0..0....0..0..1..0....0..1..0..0 ..1..0..1..1....0..1..0..0....0..0..1..1....1..0..0..0....1..0..0..0 ..0..0..1..1....0..0..1..0....0..0..0..1....0..0..0..0....0..1..0..1 ..0..0..1..0....0..0..0..1....0..0..1..1....0..1..1..1....0..1..1..1 CROSSREFS Sequence in context: A051738 A052934 A136785 * A155195 A147837 A076036 Adjacent sequences:  A227380 A227381 A227382 * A227384 A227385 A227386 KEYWORD nonn AUTHOR R. H. Hardin Jul 09 2013 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.

Last modified February 17 02:22 EST 2020. Contains 331976 sequences. (Running on oeis4.)