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Search: id:A123620
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| A123620 |
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G.f.: (1+x+x^2)/(1-3*x-3*x^2). |
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| 1, 4, 16, 60, 228, 864, 3276, 12420, 47088, 178524, 676836, 2566080, 9728748, 36884484, 139839696, 530172540, 2010036708, 7620627744, 28891993356, 109537863300, 415289569968, 1574482299804, 5969315609316, 22631393727360, 85802128010028, 325300565212164
(list; graph; listen)
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