[seqfan] A007027 "motif"?

Ron Hardin rhhardin at att.net
Fri Oct 22 00:30:05 CEST 2010


This matches A007027 "Number of motifs in triangular window of side n."

Is it the same definition?  (I have no idea what a motif might be here)

Half the number of nXnXn triangular binary arrays with no upright or inverted 
2X2X2 subtriangle being all zero or all one
1 1
2 3
3 12
4 65
5 480
6 4851
7 67256
8 1281258
9 33576120
10 1211321683
11 60197760876
12 4122762095127
13 389255776509600
14 50680509287223315
15 9101288287232978112
16 2254758094831392182844
17 770722021956436752935232
18 363539142143978906122548957
19 236650032964495254358069968260
20 212619703371362709299832315303033


 rhhardin at mindspring.com
rhhardin at att.net (either)





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