cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A274892 Number of n X 5 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-1) or (-2,0) and new values introduced in order 0..2.

Original entry on oeis.org

8, 108, 86, 290, 913, 3017, 9863, 32539, 107369, 354366, 1171235, 3869271, 12787884, 42266197, 139689475, 461723614, 1526118256, 5044271535, 16673106905, 55109948877, 182157291955, 602093030588, 1990121537282, 6578044463591
Offset: 1

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Author

R. H. Hardin, Jul 10 2016

Keywords

Comments

Column 5 of A274895.

Examples

			Some solutions for n=4
..0..1..2..1..2. .0..1..2..0..2. .0..1..0..2..1. .0..1..0..1..2
..0..1..0..1..2. .0..2..0..1..2. .2..1..2..1..0. .1..2..0..2..0
..1..2..0..2..0. .1..2..1..2..0. .2..0..2..1..2. .1..0..1..2..0
..2..0..1..2..0. .2..0..1..2..0. .1..0..1..0..2. .2..0..2..0..1
		

Crossrefs

Cf. A274895.

Formula

Empirical: a(n) = a(n-1) +16*a(n-2) -120*a(n-4) -55*a(n-5) +549*a(n-6) +319*a(n-7) -1772*a(n-8) -891*a(n-9) +4300*a(n-10) +1407*a(n-11) -7992*a(n-12) -1155*a(n-13) +11470*a(n-14) +a(n-15) -12854*a(n-16) +1155*a(n-17) +11372*a(n-18) -1407*a(n-19) -7960*a(n-20) +891*a(n-21) +4357*a(n-22) -320*a(n-23) -1820*a(n-24) +55*a(n-25) +560*a(n-26) -120*a(n-28) -a(n-29) +16*a(n-30) -a(n-32) for n>34.