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 A109393 Entries in 3-dimensional solid related to Prouhet-Tarry problem. 4
 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 2, 1, 1, 5, 5, 1, 2, 5, 2, 1, 1, 1, 3, 3, 1, 1, 7, 12, 7, 1, 3, 12, 12, 3, 3, 7, 3, 1, 1, 1, 4, 6, 4, 1, 1, 9, 22, 22, 9, 1, 4, 22, 36, 22, 4, 6, 22, 22, 6, 4, 9, 4, 1, 1, 1, 5, 10, 10, 5, 1, 1, 11, 35, 50, 35, 11, 1, 5, 35, 80, 80, 35, 5, 10, 50, 80, 50 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 COMMENTS Entries of slices [1,k] in A109672, read by rows. Slice [n,0] gives A046816, slice [0,k] gives A109649, slice [n,n] gives A109673, slice [n,1] gives A109390. LINKS FORMULA Sum of terms in 2D slice [1, k] is 3^(1+k). EXAMPLE Slice [1,0]: ... 1 ... .. 1 1 ... Slice [1,1]: ... 1 1 ... .. 1 3 1 ... ... 1 1 ... Slice [1,2]: ... 1 2 1 ... .. 1 5 5 1 ... ... 2 5 2 ... .... 1 1 .... Slice [1,3]: ... 1 3 3 1 ... .. 1 7 12 7 1 ... ... 3 12 12 3 ... .... 3 7 3 .... ..... 1 1 ..... Slice [1,4]: ... 1 4 6 4 1 ... .. 1 9 22 22 9 1 ... ... 4 22 36 22 4 ... .... 6 22 22 6 .... ..... 4 9 4 ..... ...... 1 1 ...... Slice [1,5]: ... 1 5 10 10 5 1 ... .. 1 11 35 50 35 11 1 ... ... 5 35 80 80 35 5 ... .... 10 50 80 50 10 .... ..... 10 35 35 10 ..... ...... 5 11 5 ...... ....... 1 1 CROSSREFS Cf. A109390. Sequence in context: A023593 A117544 A030393 * A030348 A143811 A109673 Adjacent sequences:  A109390 A109391 A109392 * A109394 A109395 A109396 KEYWORD nonn,tabf,easy AUTHOR Philippe Deléham, Aug 26 2005 STATUS approved

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Last modified November 13 11:09 EST 2018. Contains 317133 sequences. (Running on oeis4.)