A144707 - OEIS

This site is supported by donations to The OEIS Foundation.

A144707

Diagonal sums of Pascal-like triangle A132047.

1, 1, 2, 7, 11, 22, 35, 61, 98, 163, 263, 430, 695, 1129, 1826, 2959, 4787, 7750, 12539, 20293, 32834, 53131, 85967, 139102, 225071, 364177, 589250, 953431, 1542683, 2496118, 4038803, 6534925, 10573730, 17108659, 27682391 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	LINKS	`Index to sequences with linear recurrences with constant coefficients, signature (1,2,-1,-1)`
	FORMULA	`G.f.: (1-x^2+4x^3+2x^4)/((1-x^2)(1-x-x^2)); a(n)=3F(n+1)-3-(-1)^n+20^n;` `a(n)=a(n-1)+2*a(n-2)-a(n-3)-a(n-4), n>4. [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 16 2008]`
	CROSSREFS	`Sequence in context: A141183 A103182 A160698 * A045373 A075431 A184799` `Adjacent sequences: A144704 A144705 A144706 * A144708 A144709 A144710`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 19 2008`

Content is available under The OEIS End-User License Agreement .

Last modified February 14 22:30 EST 2012. Contains 205678 sequences.