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 A185826 Sum of the next n natural numbers raised to the n-th power. 2
 1, 25, 3375, 1336336, 1160290625, 1870414552161, 5026507568359375, 20882706457600000000, 126834469112674289266929, 1078732544346879404306640625, 12415028528548173886807771291871, 188031682201497672618081000000000000, 3661926425131437024691115607984619140625 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Write the natural numbers in groups, with group sizes incremented by one, each time: 1; 2,3; 4,5,6; 7,8,9,10; ... and add the numbers in each group, then take the i-th power for the i-th group to get the i-th entry in the sequence. LINKS Harvey P. Dale, Table of n, a(n) for n = 1..158 FORMULA a(n) = A006003(n)^n. a(n) = ((n + n^3)/2)^n. - Harvey P. Dale, Apr 24 2022 MATHEMATICA Module[{nn=15}, #[[1]]^#[[2]]&/@Thread[{Total/@TakeList[Range[(nn(nn+1))/2], Range[ nn]], Range[nn]}]] (* or *) Table[((n+n^3)/2)^n, {n, 20}] (* Harvey P. Dale, Apr 24 2022 *) PROG (Python) num = 100 n = 0 a = range(num+1) for i in range(1, num): ....sum = 0 ....for j in range(1, i+1): ........sum = sum + (n+j) ....n = n + i ....a[i] = sum**i CROSSREFS Cf. A006003. Sequence in context: A203186 A322249 A373878 * A178026 A012748 A337725 Adjacent sequences: A185823 A185824 A185825 * A185827 A185828 A185829 KEYWORD nonn AUTHOR Amir H. Farrahi, Feb 05 2011 EXTENSIONS Edited by N. J. A. Sloane, Feb 05 2011 STATUS approved

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Last modified July 18 00:08 EDT 2024. Contains 374377 sequences. (Running on oeis4.)