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.

A254451 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally and vertically.

Original entry on oeis.org

3036, 26380, 196684, 1279568, 8004340, 48345120, 289945200, 1735438880, 10399188560, 62416180384, 375009286716, 2254540612636, 13558023603848, 81542178909476, 490442432067776, 2949842103362336, 17742389731217108
Offset: 1

Views

Author

R. H. Hardin, Jan 30 2015

Keywords

Comments

Column 2 of A254457

Examples

			Some solutions for n=3
..0..0..1..1....0..0..1..0....0..0..1..1....0..1..0..1....0..0..1..0
..0..0..0..0....1..1..1..1....0..0..1..0....0..1..0..0....0..0..0..0
..1..0..0..0....1..0..0..0....1..1..1..1....1..0..0..0....0..0..0..0
..0..1..0..1....1..0..1..0....0..0..0..1....0..0..1..0....1..0..0..1
..1..0..0..1....1..0..0..0....1..0..1..0....0..0..1..1....1..1..1..1
		

Formula

Empirical: a(n) = 9*a(n-1) -14*a(n-2) -44*a(n-3) +135*a(n-4) -59*a(n-5) -261*a(n-6) +1059*a(n-7) -122*a(n-8) -14896*a(n-9) +36367*a(n-10) -18563*a(n-11) -33563*a(n-12) +47849*a(n-13) -4574*a(n-14) -5864*a(n-15) -66679*a(n-16) +97131*a(n-17) -7175*a(n-18) -81255*a(n-19) +42242*a(n-20) +47504*a(n-21) -23099*a(n-22) -135393*a(n-23) +262392*a(n-24) -181030*a(n-25) -7740*a(n-26) +75060*a(n-27) +21756*a(n-28) +42676*a(n-29) -404560*a(n-30) +536056*a(n-31) -182368*a(n-32) -227200*a(n-33) +191776*a(n-34) -7296*a(n-35) +220032*a(n-36) -449664*a(n-37) +242688*a(n-38) +158208*a(n-39) -242176*a(n-40) +54272*a(n-41) -36864*a(n-42) +126976*a(n-43) -90112*a(n-44) -32768*a(n-45) +81920*a(n-46) -32768*a(n-47) for n>61