A159222 1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 21

7, 20, 45, 95, 193, 389, 777, 1553, 3097, 6185, 12345, 24665, 49273, 98489, 196857, 393593, 786937, 1573625, 3146745, 6292985, 12584953, 25168889, 50335737, 100669433, 201334777, 402665465

Offset

2,1

Links

Table of n, a(n) for n=2..27.

Crossrefs

Sequence in context: A175428 A232599 A011934 * A100206 A298288 A299384

Adjacent sequences: A159219 A159220 A159221 * A159223 A159224 A159225

Keyword

nonn

Author

R. H. Hardin Apr 06 2009

Status

approved