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.
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
Keywords
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
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
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.
Comments