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 A212123 Total number of pairs of states of the first n subshells of the nuclear shell model in which the subshells are ordered by energy level in increasing order. 8
 1, 3, 4, 7, 8, 10, 14, 16, 19, 20, 25, 29, 32, 34, 35, 41, 46, 50, 53, 55, 56, 63, 68, 71, 77, 81, 82, 84, 92 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS First differs from A213363 at a(12). LINKS FORMULA a(n) = A212124(n)/2. EXAMPLE Example 1: written as a triangle in which row i is related to the (i-1)st level of nucleus. Triangle begins: 1; 3,    4; 7,    8,  10; 14,  16,  19,  20; 25,  29,  32,  34,  35; 41,  46,  50,  53,  55,  56; 63,  68,  71,  77,  81,  82,  84; ... Example 2: written as an irregular triangle in which row j is related to the j-th shell of nucleus. Note that in this case row 4 has only one term. Triangle begins: 1; 3,   4; 7,   8, 10; 14, 16, 19, 20, 25; 29, 32, 34, 35, 41; 46, 50, 53, 55, 56, 63; 68, 71, 77, 81, 82, 84, 92; ... CROSSREFS Partial sums of A212121. Other versions are A210983, A212013, A213363, A213373. Cf. A000292, A004006, A212122, A212124. Sequence in context: A032788 A210983 A213363 * A213373 A332059 A229081 Adjacent sequences:  A212120 A212121 A212122 * A212124 A212125 A212126 KEYWORD nonn,tabf,hard,more AUTHOR Omar E. Pol, Jun 03 2012 STATUS approved

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Last modified August 4 15:27 EDT 2020. Contains 336201 sequences. (Running on oeis4.)