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A061348 Consider a (solid) triangle with n cells on each edge, for a total of n(n+1)/2 cells; a(n) is number of ways of labeling cells with 0's and 1's; triangle may be rotated and turned over. +0
2
2, 4, 20, 208, 5728, 351616, 44772352, 11453771776, 5864078802944, 6004800040206336, 12297829416834170880, 50371909152808594571264, 412646679762074900658913280, 6760803201217259503457555972096, 221537999297485988040673580072042496 (list; graph; listen)
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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