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A159221

1/2 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 20.

9, 23, 49, 101, 201, 401, 793, 1577, 3129, 6233, 12409, 24761, 49401, 98681, 197113, 393977, 787449, 1574393, 3147769, 6294521, 12587001, 25171961, 50339833, 100675577, 201342969, 402677753, 805339129

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OFFSET

2,1

COMMENTS

Same series for 1/2 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 10

LINKS

Table of n, a(n) for n=2..28.

CROSSREFS

Sequence in context: A363161 A183453 A296311 * A079040 A183338 A212676

Adjacent sequences: A159218 A159219 A159220 * A159222 A159223 A159224

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 06 2009

STATUS

approved

URL: https://oeis.org/A159221

⇱ A159221 - OEIS