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A012270
Duplicate of A009585.
0
0, 0, 2, 6, 22, 100, 668, 6048, 64776, 763488, 9676152, 131167080, 1900043880
OFFSET
0,3
CROSSREFS
Sequence in context: A376694 A052517 A245119 * A009585 A012267 A012268
KEYWORD
dead
STATUS
approved