A204212 Number of length n+1 nonnegative integer arrays starting and ending with 0 with adjacent elements differing by no more than 7

1, 8, 64, 652, 7120, 82440, 991152, 12262470, 155072356, 1995610260, 26048900628, 344054761656, 4589736845308, 61750810543324, 836935922008844, 11416462124627925, 156613134014878257, 2159264087976308543

Offset

1,2

Comments

Column 7 of A204213

Links

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

Example

Some solutions for n=5
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..4....2....7....4....7....6....4....6....4....4....2....4....6....3....1....4
..6....0....9....7....9....6....0....4....3....4....6....5....6....9....6...10
..6....2...14....7...12....8....7....2....4....8....2....8....4....5....2...12
..5....7....7....7....6....1....2....7....4....6....4....5....4....2....5....5
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

Crossrefs

Sequence in context: A366497 A355214 A047900 * A238724 A318640 A088038

Adjacent sequences: A204209 A204210 A204211 * A204213 A204214 A204215

Keyword

nonn

Author

R. H. Hardin Jan 12 2012

Status

approved