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A178643 Square array read by antidiagonals.Convolution of a(n)= 2*a(n-1)-a(n-2) and 10^n. 0
1, 10, 2, 100, 19, 4, 1000, 190, 36, 8, 10000, 1900, 361, 68, 16, 100000, 19000, 3610, 686, 128, 32, 1000000, 190000, 36100, 6859, 1304, 240, 64, 10000000, 1900000, 361000, 68590, 13032, 2480, 448, 128 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonals sum up to A014824, the decimal expansion of fraction 1/81. Alternating diagonal sum gives decimal expansion of fraction 1/119.

LINKS

Table of n, a(n) for n=1..36.

EXAMPLE

Array starts:

1,2,4,8,

10,19,36,68,

100,190,361,686,

1000,1900,3610,6859,

CROSSREFS

Cf. A014824, A000129, A021123, A021083, A178511

Sequence in context: A001202 A054841 A185076 * A038304 A290308 A159005

Adjacent sequences:  A178640 A178641 A178642 * A178644 A178645 A178646

KEYWORD

easy,nonn,tabl

AUTHOR

Mark Dols, May 31 2010

STATUS

approved

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Last modified May 21 01:18 EDT 2019. Contains 323429 sequences. (Running on oeis4.)