A321355 - OEIS

A321355

Expansion of Product_{k>=0} (1 + x^(4^k))^(4^(k+1)).

1, 4, 6, 4, 17, 64, 96, 64, 136, 480, 720, 480, 680, 2240, 3360, 2240, 2444, 7536, 11304, 7536, 7276, 21568, 32352, 21568, 21080, 62752, 94128, 62752, 62968, 189120, 283680, 189120, 178646, 525464, 788196, 525464, 454614, 1292992, 1939488, 1292992, 1085688, 3049760

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OFFSET

0,2

COMMENTS

Also the coefficient of x^(4*n) in the expansion of Product_{k>=0} (1 + x^(4^k))^(4^k).

LINKS

Table of n, a(n) for n=0..41.

EXAMPLE

Product_{k>=0} (1 + x^(4^k))^(4^k) = 1 + x + 4*x^4 + 4*x^5 + 6*x^8 + 6*x^9 + 4*x^12 + 4*x^13 + 17*x^16 + 17*x^17 + 64*x^20 + 64*x^21 + 96*x^24 + 96*x^25 + ... .

CROSSREFS

Cf. A073708, A321345, A321354, A321357.

Sequence in context: A019077 A019245 A019191 * A185145 A258836 A292387

Adjacent sequences: A321352 A321353 A321354 * A321356 A321357 A321358

KEYWORD

nonn

AUTHOR

Seiichi Manyama, Nov 07 2018

STATUS

approved