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A077383
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a(1) = 1, then add, multiply and subtract 2, 3, 4; 5, 6, 7; ... in that order.
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1
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1, 3, 9, 5, 10, 60, 53, 61, 549, 539, 550, 6600, 6587, 6601, 99015, 98999, 99016, 1782288, 1782269, 1782289, 37428069, 37428047, 37428070, 898273680, 898273655, 898273681, 24253389387, 24253389359, 24253389388, 727601681640, 727601681609
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| a(2) = a(1) + 2 = 3, a(3) = 3*3 = 9, a(4) = 9-4 = 5, a(5) = 5 + 5 = 10, etc.
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MAPLE
| a := proc(n) if n=1 then 1 elif n mod 3 = 2 then a(n-1)+n elif n mod 3 = 0 then n*a(n-1) elif n mod 3 = 1 then a(n-1)-n else fi end: (from Emeric Deutsch)
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CROSSREFS
| Cf. A077382, A077384.
Sequence in context: A197023 A096418 A100811 * A084492 A084496 A084530
Adjacent sequences: A077380 A077381 A077382 * A077384 A077385 A077386
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 06 2002
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Dec 17 2003
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