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A140505 Second differences of Jacobsthal sequence A001045, pairs with even and odd indices swapped. +0
4
2, -1, 4, 0, 12, 4, 44, 20, 172, 84, 684, 340, 2732, 1364, 10924, 5460, 43692, 21844, 174764, 87380, 699052, 349524, 2796204, 1398100, 11184812, 5592404, 44739244, 22369620, 178956972, 89478484, 715827884, 357913940, 2863311532, 1431655764, 11453246124 (list; graph; listen)
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.


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