A047673 Row 4 of square array defined in A047671.

1, 13, 61, 193, 481, 1021, 1933, 3361, 5473, 8461, 12541, 17953, 24961, 33853, 44941, 58561, 75073, 94861, 118333, 145921, 178081, 215293, 258061, 306913, 362401, 425101, 495613, 574561, 662593, 760381, 868621, 988033, 1119361

Offset

1,2

Links

Table of n, a(n) for n=1..33.

Formula

n^4 - 2n^3 + 5n^2 - 4n + 1.

Crossrefs

Sequence in context: A353223 A302560 A252970 * A231800 A141725 A279762

Adjacent sequences: A047670 A047671 A047672 * A047674 A047675 A047676

Keyword

nonn

Author

N. J. A. Sloane

Status

approved