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 A101845 Triangle formed by left half of A101842, read by rows. 2
 1, 1, 3, 1, 7, 16, 1, 15, 61, 115, 1, 31, 206, 626, 1056, 1, 63, 659, 2989, 7554, 11774, 1, 127, 2052, 13308, 47349, 105099, 154624, 1, 255, 6297, 56935, 274677, 824331, 1660957, 2337507, 1, 511, 19162, 237862, 1518478, 5960818, 15747154, 29428654 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Table of n, a(n) for n=1..44. EXAMPLE Triangle begins: 1, 1, 3, 1, 7, 16, 1, 15, 61, 115, 1, 31, 206, 626, 1056, 1, 63, 659, 2989, 7554, 11774, MAPLE A101842 := proc(n, k) option remember ; if k < -n or k >= n then 0 ; elif n = 1 then 1; else (n-k)*A101842(n-1, k-1)+A101842(n-1, k)+(n+k+1)*A101842(n-1, k+1) ; fi ; end: A101845 := proc(n, k) A101842(n, -n+k-1) ; end: for n from 1 to 10 do for k from 1 to n do printf("%d, ", A101845(n, k)) ; od: od: # R. J. Mathar, Aug 07 2007 CROSSREFS Sequence in context: A218638 A232295 A228763 * A193606 A221328 A280610 Adjacent sequences: A101842 A101843 A101844 * A101846 A101847 A101848 KEYWORD nonn,tabl AUTHOR David Applegate, Jun 19 2007 EXTENSIONS More terms from R. J. Mathar, Aug 07 2007 STATUS approved

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Last modified August 4 13:44 EDT 2024. Contains 374923 sequences. (Running on oeis4.)