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A059513 Variation of Boustrophedon transform applied to 1,1,1,1,... Fill an array by diagonals, in alternating directions. The first entry is 1 each time. For the next element of a diagonal, add to the previous element the elements of the row and the column the new element is in. The final element of each diagonal gives a(n). 3
1, 2, 6, 23, 116, 736, 5659, 50796, 521040, 6006587, 76874524, 1081439062, 16586149365, 275442822510, 4924040788654 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

The array begins

1 ....2 ...1 ..23 ..1 ...

1 ....4 ..19 ..48 ...

6 ...13 ..87 ...

1 ..107 ...

116 ...

1 ...

CROSSREFS

Cf. A000667, A035002, A059216, A059219, A059575, A059574.

Sequence in context: A317128 A185334 A290280 * A132647 A177253 A020122

Adjacent sequences:  A059510 A059511 A059512 * A059514 A059515 A059516

KEYWORD

easy,nonn

AUTHOR

Floor van Lamoen, Jan 23 2001

STATUS

approved

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Last modified August 11 23:45 EDT 2020. Contains 336434 sequences. (Running on oeis4.)