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

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A278794 Number of nX3 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. 1
 4, 1713, 145208, 7196852, 263134490, 7804657491, 197112382716, 4361870602212, 86190316947578, 1541836669016245, 25236090146159518, 381171321062737412, 5350587072804920340, 70218509804475284134, 865927060368778196406 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A278798. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 R. H. Hardin, Empirical polynomial of degree 173 FORMULA Empirical polynomial of degree 173 (see link above) EXAMPLE Some solutions for n=3 ..0..0..0. .2..3..2. .0..0..1. .1..2..1. .2..0..0. .0..2..1. .2..2..0 ..3..0..1. .3..2..0. .2..1..1. .0..0..0. .1..0..0. .0..0..3. .1..3..1 ..1..0..3. .0..1..3. .1..1..1. .3..2..0. .3..0..3. .0..0..3. .2..1..3 CROSSREFS Cf. A278798. Sequence in context: A280793 A160225 A316484 * A141090 A307580 A255268 Adjacent sequences:  A278791 A278792 A278793 * A278795 A278796 A278797 KEYWORD nonn AUTHOR R. H. Hardin, Nov 28 2016 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 November 24 18:11 EST 2020. Contains 338616 sequences. (Running on oeis4.)