A262760 Number of (3+2)X(n+2) 0..1 arrays with each row divisible by 5 and each column divisible by 7, read as a binary number with top and left being the most significant bits.

5, 25, 49, 129, 709, 4953, 16705, 73345, 384485, 2252185, 9821425, 47556225, 241769125, 1278440025, 6106506625, 30240858625, 152043549125, 774590745625, 3814859880625, 19015880330625, 95252710613125, 479215784705625

Offset: 1

Author

R. H. Hardin, Sep 30 2015

Keywords

• nonn

Comments

Row 3 of A262759.

Examples

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

Links

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

Crossrefs

Cf. A262759.

Formula

Empirical: a(n) = 5*a(n-1) +290*a(n-4) -1450*a(n-5) -19200*a(n-8) +96000*a(n-9) +370750*a(n-12) -1853750*a(n-13) -1409375*a(n-16) +7046875*a(n-17)