A093659 - OEIS

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A093659

First column of lower triangular matrix A093658.

1, 1, 1, 2, 1, 2, 2, 6, 1, 2, 2, 6, 2, 6, 6, 24, 1, 2, 2, 6, 2, 6, 6, 24, 2, 6, 6, 24, 6, 24, 24, 120, 1, 2, 2, 6, 2, 6, 6, 24, 2, 6, 6, 24, 6, 24, 24, 120, 2, 6, 6, 24, 6, 24, 24, 120, 6, 24, 24, 120, 24, 120, 120, 720 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	FORMULA	`a(2^n) = n! for n>=0. a(2^n+2^m) = a(2^(m+1)) for n>m>=0.` `a(n) = A000120(n)! (factorial of the number of 1's in binary expansion of n).`
	CROSSREFS	`Cf. A093658.` `Cf. A093677, A000120.` `Sequence in context: A058701 A004559 A095291 * A200745 A067541 A054706` `Adjacent sequences: A093656 A093657 A093658 * A093660 A093661 A093662`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Apr 08 2004`

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Last modified February 16 23:45 EST 2012. Contains 205978 sequences.