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A084606 Triangle, read by rows, where the n-th row lists the (2n+1) coefficients of (1+2x+2x^2)^n. 5
1, 1, 2, 2, 1, 4, 8, 8, 4, 1, 6, 18, 32, 36, 24, 8, 1, 8, 32, 80, 136, 160, 128, 64, 16, 1, 10, 50, 160, 360, 592, 720, 640, 400, 160, 32, 1, 12, 72, 280, 780, 1632, 2624, 3264, 3120, 2240, 1152, 384, 64, 1, 14, 98, 448, 1484, 3752, 7448, 11776, 14896, 15008, 11872 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..59.

EXAMPLE

Rows:

{1},

{1,2,2},

{1,4,8,8,4},

{1,6,18,32,36,24,8},

{1,8,32,80,136,160,128,64,16},

{1,10,50,160,360,592,720,640,400,160,32},

{1,12,72,280,780,1632,2624,3264,3120,2240,1152,384,64},

PROG

(PARI) for(n=0, 15, for(k=0, 2*n, t=polcoeff((1+2*x+2*x^2)^n, k, x); print1(t", ")); print(" "))

CROSSREFS

Cf. A002426, A084600-A084605, A006139, A084608-A084615.

Sequence in context: A299504 A300979 A167622 * A304209 A137399 A158985

Adjacent sequences:  A084603 A084604 A084605 * A084607 A084608 A084609

KEYWORD

nonn,tabf

AUTHOR

Paul D. Hanna, Jun 01 2003

STATUS

approved

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Last modified July 28 19:33 EDT 2021. Contains 346335 sequences. (Running on oeis4.)