A187991 Number of nondecreasing arrangements of 7 numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*2^|x(i)| zero.

411, 632, 912, 1257, 1673, 2166, 2742, 3407, 4167, 5028, 5996, 7077, 8277, 9602, 11058, 12651, 14387, 16272, 18312, 20513, 22881, 25422, 28142, 31047, 34143, 37436, 40932, 44637, 48557, 52698

Offset: 1

Author

R. H. Hardin, Mar 18 2011

Keywords

• nonn

Comments

Row 7 of A187988.

Examples

			Some solutions for n=3:
  -7  -8  -7  -1  -6  -8  -8  -7  -4  -6  -7  -5  -8  -7  -8  -6
  -4  -5  -2  -1  -3  -5  -6  -5  -2  -3  -5  -3  -3  -7  -3  -5
  -4  -1  -2  -1  -1   2  -1  -3  -2  -3   4   1  -2  -7  -3  -4
  -4   0   1  -1   1   2   0   3  -2   2   4   1  -2   6   4   4
   4   0   1   1   2   3   0   5  -1   2   5   1   3   6   6   5
   5   5   2   1   2   4   6   6  -1   3   5   1   3   7   6   5
   7   8   7   2   6   8   8   6   5   6   6   5   8   7   7   5
		

Extensions

a(26) corrected by R. J. Mathar, May 11 2023