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A077384 a(1) = 1, then add, multiply, subtract, multiply 2, 3, 4, 5; 6, 7, 8, 9; ... in that order. 1
1, 3, 9, 5, 25, 31, 217, 209, 1881, 1891, 20801, 20789, 270257, 270271, 4054065, 4054049, 68918833, 68918851, 1309458169, 1309458149, 27498621129, 27498621151, 632468286473, 632468286449, 15811707161225, 15811707161251 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

FORMULA

a(1) = 1, a(2n+1) = (2n+1)*a(2n), a(4n) = a(4n-1)-4n, a(4n+2) = a(4n+1) + 4n+2.

CROSSREFS

Cf. A077382, A077383.

Sequence in context: A252117 A103934 A186814 * A122943 A276148 A182946

Adjacent sequences:  A077381 A077382 A077383 * A077385 A077386 A077387

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Nov 06 2002

EXTENSIONS

More terms from Sascha Kurz, Jan 04 2003

STATUS

approved

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Last modified May 15 08:06 EDT 2021. Contains 343909 sequences. (Running on oeis4.)