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A238375 Row sums of triangle in A152719. 1
1, 2, 4, 6, 11, 16, 28, 40, 69, 98, 168, 238, 407, 576, 984, 1392, 2377, 3362, 5740, 8118, 13859, 19600, 33460, 47320, 80781, 114242, 195024, 275806, 470831, 665856, 1136688, 1607520, 2744209, 3880898, 6625108, 9369318, 15994427, 22619536, 38613964, 54608392 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..39.

FORMULA

a(n) = Sum_{k=0..n} A152719(n,k).

G.f.: (1+x)/((1-2*x^2-x^4)*(1-x)).

a(2*n) = A005409(n+2).

a(2*n+1) = 2*A048739(n).

EXAMPLE

Triangle A152719 begins :

1;.............................sum = 1

1, 1;..........................sum = 2

1, 2, 1;.......................sum = 4

1, 2, 2, 1;....................sum = 6

1, 2, 5, 2, 1;.................sum = 11

1, 2, 5, 5, 2, 1;..............sum = 16

1, 2, 5, 12, 5, 2, 1;..........sum = 28

1, 2, 5, 12, 12, 5, 2, 1;......sum = 40

CROSSREFS

Cf. A005409, A048739, A152719

Sequence in context: A103692 A114921 A103442 * A056342 A094719 A294811

Adjacent sequences:  A238372 A238373 A238374 * A238376 A238377 A238378

KEYWORD

easy,nonn

AUTHOR

Philippe Deléham, Feb 25 2014

STATUS

approved

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Last modified April 23 14:15 EDT 2019. Contains 322386 sequences. (Running on oeis4.)