The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A062323 Triangle with a(n,n)=1, a(n,k)=(n-1)*a(n-1,k)+a(n-2,k) for n>k. 2
 1, 0, 1, 1, 1, 1, 2, 3, 2, 1, 7, 10, 7, 3, 1, 30, 43, 30, 13, 4, 1, 157, 225, 157, 68, 21, 5, 1, 972, 1393, 972, 421, 130, 31, 6, 1, 6961, 9976, 6961, 3015, 931, 222, 43, 7, 1, 56660, 81201, 56660, 24541, 7578, 1807, 350, 57, 8, 1, 516901, 740785, 516901, 223884 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 LINKS Reinhard Zumkeller, Rows n = 0..120 of triangle, flattened FORMULA a(n, k)=k*a(n, k+1)+a(n, k+2) for n>k. PROG (Haskell) a062323 n k = a062323_tabl !! n !! k a062323_row n = a062323_tabl !! n a062323_tabl = map fst \$ iterate f ([1], [0, 1]) where    f (us, vs) = (vs, ws) where      ws = (zipWith (+) (us ++ [0]) (map (* v) vs)) ++ [1]           where v = last (init vs) + 1 -- Reinhard Zumkeller, Mar 05 2013 CROSSREFS Essentially the same as A058294, but more easy seen as a triangle. Columns include A001040, A001053, A058307, A058308, A058309. Other sequences appearing on the right hand side include A000012, A001477, A002061, A034262. Sequence in context: A167772 A077870 A294408 * A291087 A020858 A090664 Adjacent sequences:  A062320 A062321 A062322 * A062324 A062325 A062326 KEYWORD nonn,tabl AUTHOR Henry Bottomley, Jul 05 2001 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 24 22:57 EST 2020. Contains 332216 sequences. (Running on oeis4.)