A263120 Number of (n+3)X(2+3) 0..1 arrays with each row divisible by 15 and column not divisible by 15, read as a binary number with top and left being the most significant bits.

36, 148, 522, 1708, 5124, 15640, 47602, 144236, 432708, 1295524, 3883594, 11649676, 34949028, 104703688, 313818418, 940969804, 2822909412, 8465899188, 25390861962, 76159749740, 228479249220, 685409187320, 2056136698226

Offset: 1

Author

R. H. Hardin, Oct 10 2015

Keywords

• nonn

Comments

Column 2 of A263124.

Examples

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

Links

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

Crossrefs

Cf. A263124.

Formula

Empirical: a(n) = 4*a(n-1) -a(n-2) -8*a(n-3) +48*a(n-4) -168*a(n-5) +48*a(n-6) +312*a(n-7) -955*a(n-8) +2884*a(n-9) -955*a(n-10) -4832*a(n-11) +7632*a(n-12) -16032*a(n-13) +7632*a(n-14) +17568*a(n-15) +4886*a(n-16) -72248*a(n-17) +4886*a(n-18) +197200*a(n-19) -366336*a(n-20) +873744*a(n-21) -366336*a(n-22) -1155888*a(n-23) +1014058*a(n-24) -588568*a(n-25) +1014058*a(n-26) -2290528*a(n-27) +6020160*a(n-28) -17209056*a(n-29) +6020160*a(n-30) [phone]*a(n-31) -27604133*a(n-32) [phone]*a(n-33) -27604133*a(n-34) [phone]*a(n-35) -75797424*a(n-36) [phone]*a(n-37) -75797424*a(n-38) -362608200*a(n-39) [phone]*a(n-40) -363318700*a(n-41) [phone]*a(n-42) -361187200*a(n-43) [phone]*a(n-44) -541780800*a(n-45) [phone]*a(n-46)